Immaturity. We all have our moments and an immature sense of humour but i don't like immaturity in general. I don't like clingyness. Bad manners and bad personality. I don't like vanity and over cocky or confident. There's a difference between being confident and being up yourself. As far as looks go, it annoys me when guys wear their trousers half way down their A'rse so you can see their undies, and it looks like they're going to drop with the movement of the bus. If they aint held up safely someone could come and pull them down. I also dislike smoking and irresponsibility.