You may not like them, and you may not want to hang out with them, but your man's friends are important to him. Regardless of what you think of them, they're here to stay, and they play an important role in your guy's life. If you and your partner have different interests - perhaps you're not a sports nut, and he is, for example - then you can only compromise so much on your social activities before one person feels slighted. So let your man play golf, watch football or have a few pints of that dark craft beer you won't touch with a like-minded buddy. It gives you the time you need to hang out with friends of yours who enjoy doing the things you like.
This way, you won't resent your mate when he flat-out refuses to see that chick flick or go paint pottery with you. And it's important that he has the one-on-one time with his buddies - your relationship may even depend on it. When he's able to process whatever stresses he has going on - whether it's work or even your relationship - by talking it out with friends, then he can blow off some steam and get a fresh perspective. The problem occurs when it seems he'd rather spend time with his friends than with you. If he's going out almost every night with the guys, or he comes home falling-down drunk when he does go out, then it can be a problem. But for the most part, when you let him hang out with the guys once in a while - without tagging along - he'll appreciate you more.