Is it normal to be bothered about my partner watching disturbing videos online?

So my boyfriend is a hacker, programmer etc. He has hacked into pretty sick websites and tells me sometimes about stuff he finds on 4chan. About women being undressed and beaten in the cold for example. I don't know I feel really weird and bothered that he watched stuff like that. He seems normal and everything but I think it's super weird.
Is it normal to be bothered about my partner watching disturbing videos online?
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