Don't be tooo opinionated. And, I am not saying you shouldn't have opinions. You should. But, keep them uncomplicated and unconvicting and certainly don't be vindictive in your belief of things like views of healthcare, sequestration, you know, politics. In fact, as much as it is up to you, leave politics out of the conversation.
Just talk about things that are simple and fun and keep from arguing with the other person, but, if you do want to argue, then, that's a PRETTY GOOD idea that that person is not right for you. Now, arguments can be good too IF you BOTH end them constructively, as everyone has opinions on things, that's human nature. Movies, music, etc. But, unless you really strongly don't like the person and want to have a simple way to let them know you are not interested, then, don't make a big deal about a music group they like that you HATE . The Lord leads.