My boyfriend got mad at me for watching documentaries

I like watching documentaries when I can. im a curious person, have been since I was young. My Mum is very similar. Usually I watch ones that cover darker topics (disabilities, strange addictions, etc), but I also frequently watch lighter hearted ones (pop culture, prodigies, etc.)

My boyfriend asked me what I was doing, and I told him I was watching a documentary. He asked me what about. I told him it was about a 16 year old girl who had the physical and mental look/way of a toddler. It was a very interesting documentary, it did have a sad ending though.

He was repulsed and said I shouldn’t watch those kind of things. I asked him why? He said he hates those kind of documentaries, and that I should only watch ones about good, happy things (i.e light subject matter) and to not show him these things. I got annoyed by this, and apologised for showing him what I was watching (even though he asked) and told him that I want to learn about everything, good and bad. I don’t want to be ignorant of bad things going on in the world, and it’s interesting to watch. He half-heartily apologised and I said he didn’t have to apologise, he can have an opinion. Now he’s being curt and short with me.

I don’t understand how he can think this way. I’m educating myself about the struggles other people have. It’s not like I’m watching anything horribly graphic or disturbing, just about a little girl who has a disability. Normally I would back down during a conflict, but it was so ridiculous to me that I had to say something. Is this not a weird thing for someone to say? Am I being crazy?