Boys vs Girls
The Rub: It can be as simple as him borrowing your books and taking forever to return them. Or the fact that he arrives at any gimmick late, while you have a tendency to make him wait for thirty minutes or more when he picks you up. Or that he hates the smell of durian while you can't get enough of it. Whatever you do, there will always be a few personal habits that will annoy other people. Will it affect a relationship or friendship? It's always possible.
The Solution: It's all about compromise. Talk about why certain habits annoy you. If some things remain non-negotiable after the talk, then maybe you can agree to disagree while working with them. Helpful ideas like cute, colorful sticky notes with reminders placed in strategic areas are always a good idea. Advanced notice is also nice, particularly if someone's planning to eat durian.