Why is my brother so critical of everything I do?

Though some criticism is legit, other times I get criticized for stupid trivial stuff like the movies and shows I watch or the video games I play. Supposedly I'm nerdy for watching the star wars movie and I'm childish for going back to reminisce and watch a few of dragonballz. I don't get it sometimes. Seems like I everything I do, I'm open for being criticized for and it seems kind of lame to me.