Why are people in Instagram comment sections so rude?

I had several guys attack my comment about me saying that my boyfriend likes my body a lot and prefers me over any other girl's body, and told me "he is lying to you to make you feel comfortable" or one dude said "so you prefer to be buttless rather than have the butt of the girl on the video?" . First of all I do have a butt just not a disproportionately HUGE one , which suits my body and sticks out just enough. I don't even have photos of my butt on social media I don't get it how those dudes even judge my body from Instagram 😂 and i know my boyfriend way better than they do to know he isn't lying lol.

Why are people in Instagram comment sections so rude?
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