While I haven't played high level Magic, I have been competitive in several other sports and games, and I have often given advice during matches. If there is a rule against giving a player advice, so be it. I'll abide by the rule. If there isn't, I'll freely give advice. For several reasons:
1) I don't like asterisks next to my victories
2) I like knowing my opponent played the very best they could. You can punch kindergartners in the face all day long and feel like a champ, doesn't mean you'll last a single round in an MMA tournament. When your opponent played flawlessly and with (in this case) an actually competitive deck and you still win, you learn a lot more than when your opponent forgets to draw a card four turns in a row.

Again, assigning of Trample damage is different than advising your opponent on which creatures to attack with. Like I said, there are reasons you may not want to assign all the trample damage to the opponent, but those instances are exceedingly rare. I would simply inquire if it was a mistake because of the stress of the event (highly likely to happen) or if it was a genuine choice.

For instance: Was it the right call to kill off Rhino and take a damage rather than Tasigur and not take a damage? What do you learn if you won the game with only 1 life left? That your opponents mistake gave you the game, not that you made the right call.

I'm not judging you as a person because of this, but as a competitor I can't take your win-streak seriously if you get upset because a commonly overlooked, stress induced mistake simply got mentioned and you felt that threatened your record.

The difference is between forgetting a rule in a game with a 700 pages rulebook, or an action in a game with tons of moving parts per round and a tactical or strategic mistake. I'll never fault someone for not giving tactical or strategic advice. But when it's obvious your opponent is about to move onto the main phase and hasn't drawn a card...rather than wait and eagerly point out cheating, I'll casually remind them they haven't drawn a card. If they haven't played a land, but I know they have a land in hand and they're about to move onto the end step I'll ask "Play the land?" If they say no...cool. If they say "oh, yeah, thanks" then cool. If they forget a rebound...I'll remind them.

I play almost exclusively online. When I was first learning MTGO, I had a player refuse to teach me how to undo a tapped land under the same old "You should know what you're doing" argument. It was a critical mistake that I couldn't figure out how to undo it in time.

MTGO is one of the reasons I think about the events the way I do. MTGO automatically assigns Trample damage to the player...you have to actively undo it if you want to assign the additional damage to the creature. I am aware this is a legal move. If I were to move back to real life play, a lot of the automatic things MTGO does for me...I may forget about.

As for judging you as a person...your actions in an MtG tournament do not define the entirety of your being. I have an opinion of you as a tournament player and that opinion will decide how I act if I play a game against you. It doesn't mean I think you would be as serious in a casual game, nor would it affect my decision to go into business with you. Those are all different arenas and require a far grander scope than "Seems to be more about the prize than the play in tournaments."

As for me jumping to conclusions...I don't understand why you would be upset enough such a small incident unless it was because it made it harder for you to win. So that is the conclusion I came to...I mean, the only reason I could think that it would matter, is because if you assume your opponent doesn't know about Trample, then you can freely chump tramplers in future instances without having to worry about the damage going through...that's exploiting a player rather than playing Magic.

Its not like someone said "You know that if you put a counter on that creature instead both of your creatures survive that removal right?" The judge simply clarified the actions taken, for justifiable reasons since not carrying trample damage through is pretty weird, and the opponent may have learned something from the interaction, or may have just remembered they acted rashly and now they feel embarrassed and are a bit on tilt.

Another reason I'm jumping to the conclusion...you haven't complained that the judge assumed you were cheating, or patronized the other player's choice to direct all damage to Thragtusk...you specifically complained about your opponent getting advise. That indicates you were hoping to exploit that players weakness in the future rather than feeling like the judge stepped over a boundary by calling two players' professionalism into question.

I also didn't claim my opinion was right...nor did I claim it was noble. I didn't say "I do this for my opponent". I specifically stated I did it because I wanted a more pure victory...thats about as selfish and egotistical as you can get.

There isn't really a right answer...I get information if I try and remind my opponent about an action and they continue to not take that action...I don't like when that happens, but it happens sometimes and it gives me an edge. If I don't say anything and they meant to take the action...they feel like I cheated them and my victory is based on an accident rather than solid play.