Why is he acting like that?

I'm an adult, and I still like to watch animated shows and movies. The only problem is that my boyfriend often makes fun of that, and interrupts me from watching them

Last time, I noticed that the Powerpuff Girls were on Netflix and he said "You wouldn't watch that, right? They're for kids"

I also like to read webcomics and I remember that I was reading one on my phone (with him being at my side), when a cringy scene was portrayed and he just snatched my phone away saying "That's too cringe"

I noticed that for a while now that he kind of belittles my interests and at first I let it pass but now it's starting to annoy me

Why is he acting like that?
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