Whenever my girlfriend asks me to join her when she goes to visit her friends I say no because I do not like her friends. Do you think I should keep on saying no?
Don't go to visit them if you don't like them, you'll only have a miserable time. If she ever asks you why you don't want to visit them, I would tell the truth or she might thinks its a problem with her. You don't have to say anything harsh though, you could just say that you don't really get on with them. Do you like any of her friends or is it just a certain group?
I think you should make the effort now and again but not go with her on a regular basis. It�s important that you both maintain your own friendships anyway and that you don�t get in the habit of socialising only as a couple, that�s when I think rot can set in. Tell her that you want her to enjoy herself with her friends by herself so that she can give her full attention to her friends without worrying about whether you�re enjoying yourself. That way you�ll make it sound like you have her interests at heart. That�s how I got out of regularly seeing one of my bf�s friends who winds me up! It�s natural to come across people you don�t get along with for one reason or another but I don�t think you should tell her you don�t like her friend(s).
Just read your Q again. Do you mean you don't like any of them? If so I'm inclined to agree with In a Pickle. They say you can tell a lot about a person by the company they keep!