How do I deal with my boyfriend's friends. I don't like them and they're disrespectful?

If he picks his friends over you, then he clearly doesn't respect you, which is a bad sign. When my on/off again boyfriend of 3 years did that SAME exact thing to me when we first started dating, I made him compromise. I said to him "ya know what? From now on, it's either gonna be me or them, I can't take this sh** anymore". And he picked me and limited the time he spent with them from there on out.