My biggest regret would probably be that I went in there with a pretty closed mind. When you go to uni you meet all sorts of people from all over the world and have different beliefs. There are people who are black, white, gay, straight, guys that wear fez's, skirts and lipstick to lectures, aggressive people, passive people, w*nkers and amazing people all chucked in to the same pot.
During my first year I was so dismissive of some people. But uni just opens your eyes up to how diverse the world is. I wish I could have been more accepting and open when I went into uni because there's no point in trying to fight it; everyone is different are you're always going to meet people you don't like or find incredibly weird. Just accept it, embrace it and don't let it annoy you! You might find that they turn out to be your best friend if you give them a chance.