in a football stadium, are the fans of different teams generaly blended together?

Generally, the visitors sit near their team's band in the stands, and if not there, normally on the side facing the sun (if there is one at the stadium). Of course, all the visitor fans do not take up the whole side, so there are many home fans blended in.

Also, all the students at the home college are in one, two, or three sections. Very hard-core fans and young adults sit near by the students.

I think that the clubs and the FA should look at the game of Rugby for inspiration. It was once said that "Football is a gentleman's game played by hooligans and Rugby is a hooligan's game played by gentlemen". Where would a saying like that come from? It is a direct consequence of the way the players act during the game. In Rugby the players call the referee "sir" and show respect for his decisions. If a player shows disrespect the team get penalised 10 metres. Also, if the referee wishes to talk to someone he calls that player over along with his captain. The captain is like a translator in this respect. The ref talks to the captain. After they get sent away the captain can, if he wishes, admonish the player or give him a pep talk. In football they harass the referee, which is disgusting and not a good picture for the game. All this leads to the way in which the supporters act. I think it is fair to say that security at football grounds is only a problem now that the game is professional and the players get paid a fortune yet act disgracefully. A lot of them are role models for young kids so there should be NO excuse for cheating, play-acting, diving, fighting, spitting, or being unsporting. If you want to improve things in the game start with the players! they need to be educated... then, maybe, eventually the fans will start to mimic the good behaviour shown by the players.

I think there are certain visitor sections but you always see some opposing fans mixed in all over the stadium.

once out team lost and this guy was all trashing my friend and he got jumped by like 200 people i dont know if he died or what and i dont care?

Different sides, otherwise it could get pretty bad. =P

they have to different sides because fights break out lol...some ballzy people sit on other side to piss people off.

they have different sides

lots of fighting.