Theyre not normal. I remember I went to cardiff for the cup final 2005 and the coach dropped me in the wrong part of town, the designated united side, i was wearing an arsenal shirt and on my own,trying to take a short cut to avoid the crowds i ended up outside some back street pub full of united fans, I was walking past it and they cornered me like in a circle, then closed in, about 7 of them, grown men. I thought here we go, id get a punch in at least before Id get battered. But they didnt get violent, just screamed all sorts of abuse , they looked very angry , got right up to my face, spitting as they screamed, I just stood there looking at them, eventually they opened up and walked off. I still have no idea what the fuck was all that about. Had a few other incidents, all back when the rivalry was big, strange lot.