Projection

When a person reacts strongly in a negative way towards you because of your tastes in movies, music, or interests that have nothing to do with them, it reveals what's inside of that person who reacted not because it's anything to do with you but because of what's inside the person expressing judgmental dislike of your tastes. 

They are projecting whatever strong negative emotion they have buried in themselves and when a different perspective triggers their sense of vulnerability, they react strongly as a self defense mechanism to protect themselves from their fragile vulnerability or ego. That's not necessarily saying they're bullies as they can be genuinely nice to people who share similar values or interests in things and be positive and know how to have fun. 

But when they can't fathom someone who's different and in a sense mirrors who they really are or how they're really feeling beneath the surface, whether subconsciously or not they tend to project their emotions because they struggle to make peace with and articulate their vulnerability. 

There's nothing wrong with expressing opinions bluntly or honestly on movies, fashion, music, and pop culture provided it doesn't belittle, disrespect, or shame that person. There's nothing wrong with being feisty or fierce in personality either. But if they can express themselves that disrespects other preferences or puts people down yet becomes very defensive when another person does it to them, they're not really about celebrating or respecting individual preferences. 

They don't really value or respect honesty or bluntness if they can't accept it even in a constructive way. Such as a person holding them accountable for being unnecessarily tactless with someone's artwork or whatever. If anything, a truly blunt person who values honesty, directness, and unapologetic expression would be like, “hey this person speaks my language. I like that.”  

So the next time they make insensitive or unhelpful "blunt" remarks on the things you like because it's actually a shield for them to express dominance. Say, "Just because you don't like it doesn't change what I like.” Or "You know, that really wasn't a nice thing to say." You don't need their approval or validation for what you like or dislike. If you know who you are and where you're going in life, focus on that and keep going.