Many people dislike Fatal1ty, but probably because they are jealous. I have played a few games of UT2K4 with the guy. He is a nice guy actually. He doesn't gloat or act rude, he accepts compliments and dishes them out as well. In the server I was in, kill limit was 75, and there were 20 or so players. Even when he had 75 points and the person in second around 15, he still did not gloat or anything. While I can see why some people may be angry over having some gamer's alias on a board as being a bit odd, it is no biggy.
And for those of you wondering, he is THAT good. I used to play UT2k4 competitively and was well up there in the ranks of the good people. Godlike bots are a piece of cake to me, and Fatal1ty handed it to me every game. Out of 75 kills(the fraglimit), he usually did not die once in the whole game. Once in a few games, he would die once or twice. When he had 75 kills, the rest of us had under 15.