It annoys me when people say "I don't like sports" or "I don't do sports".
Don't get me wrong, it's perfectly acceptable not to like something, but when somebody is talking to you about it, don't be a total buzzkill and just end it like that.
For example, say someone is talking is talking about a super cool show that they started watching, and they explain the basic plot of the story to you. You wouldn't be like "Oh I don't watch shows" when you don't find the show too interesting. You would play along and say, "Yeah sure I'll check it out!" even though you know that you're probably not gonna watch the show.
Essentially, saying "I don't do sports" when someone is trying to talk to you about sports just makes you a terrible person. Make an effort to keep the conversation going, because that's how you get to know people better and eventually get more friends.
But hey, what do I know.