There are two points to this type of person. Firstly, Wade Wilson, aka Deadpool, is an incredibly cool character. He has a unique style and is renowned by almost everyone as a character primed for the big screen. Secondly, there are different levels of Cosplay (emulating a character or simply dressing as the character.) Many people take dressing up as Deadpool to a whole new level, and while this can be cool, the in-your-face style of Deadpool makes the wearer of this costume somewhat obnoxious. This is not ubiquitous; many people make incredible Deadpool costumes without acting as though they are superior to everyone else, but there will always be someone who is under the misguided impression that he is Deadpool. Acting as the character can be really cool, but the nature of Deadpools humour and personality mean that doing so at Comic-Con can leave people rather irritated.