Unfortunately, I've encountered antisocial behaviour on many occasions on buses. Had one guy sit opposite me and proceed to insult me about my clothes. I went over to the driver to complain (I had said nothing and this point) and the driver threatened to throw me off. Also had people hit me on buses and trains. And witnessed someone sexually harassing another passenger — he stood rubbing his crotch in front of her and asked her to "finish me off".
Football fans are often bad. Especially on trains. I hate getting a train full of them.