Why does my dad always ask what I'm watching and when I respond to him he always have to question me with such a tone that sounds like he's annoyed at me.

Okay today I was watching some people exploring abonded places and he asked me what I'm watching. And I responded and asked, " Oh are you planning to do that? You know that's illegal. ". And he always does that and I'm sick of it. It seems like he doesn't trust me and thinks that I'm on a website I shouldn't metion.