Wow, that just plain down mean. My parents know for a fact that I love the show a lot, and that nothing would stop me from being a brony at all. Even though my parents say that all I'm going through right now is a phase, and that one day I'll wake up and not like the show anymore, I don't believe them. My parents have even started excepting the fact I love the show, they usually get me MLP stuff for my birthdays now and all that. And they like the fact that I like a show for once that is not violent in anyway possible, so my parents started seeing the good side on that too. All I have to say is that, don't stop being a brony, fight for yourself. If they literally force you to stop being a brony, that is just plain out wrong. But try to fight back against your parents, being a brony is a part of you and you should be proud of it.
Well good luck with your parents. Hope its goes at least ok.