People sometimes like to make fun of others because of they're insecurities. For instance, if they like something that can be seen as weird, then they would make fun of others for stuff that can be seen as "weird" so nobody will find out about their "weird" interests.
As far as what to do, just do as you please. Just ignore them and enjoy yourself.
Don't worry about what they say, cause what really matters is your friends and family.