>>213479968
Because he is weird but also strikes paralyzing fear in the other comic characters. Weirdos hate how easy it is for them to get derailed during their monologuing and how often they are judged for their unusual behavior, so they see the Joker who is also weird but people don't interrupt him when he talks and they think "If I dress and act like the Joker, people will stop interrupting me and let me spout all of my weird shit because they are afraid of me!"
These guys will never come to the conclusion that they get interrupted because their thoughts and words have no value to others, so they just want the fucker to stop annoying them with his whiny noises.