It happens to the best of us, you get someone you really enjoy being around and then they push their beliefs on you. 

Throughout my life I have run into so many situations that I'm sure everyone comes across, someone who wants to try to convince you that something you like is stupid or doesn't matter. They reinforce it by saying things like "I'm not about that life" or "I can't believe you could like that," and it's stupid. I am tired of people doing that and I am tired of people not standing up for themselves. 

I think keeping an open mind in life is so important, but there is a difference between keeping an open mind and letting people make your decisions for you. I think that if you believe in something, you shouldn't let someone talk you out of believing in it just because they are your family, friend, or significant other. Yes, their opinion is important, but they can't tell you how to live. 

You should also remember to never push your beliefs on anyone. You have to let them decide for themselves. I have had people from every end of the spectrum push me to think what they want me to think, or try to. I have learned a lot from it. I have seen it happen to people and it can make their whole life change, some for better, some for worse. I have only seen a couple people actually stand up for what they believe. Some people are too shy, some people are easily swayed, and some people just don't want to get into it, but I think you should always stand up for yourself if someone puts what you believe in, into something negative. 

You don't need to fight about it, you just need to make it be known that you can believe what you want.