Why do most people who go around calling other people ugly or insulting their looks online don’t have a profile picture showing their own face?

I know I went anonymous for this question and you cannot see my profile but I am not insulting anybody else’s looks by posting this question. I don’t think I am being hypocritical right now

Updates
8 mo
This has happened to me more than once. Every single person that has ever insulted my looks online didn’t have a profile picture showing their own face.

I wonder what these people look like?
Why do most people who go around calling other people ugly or insulting their looks online don’t have a profile picture showing their own face?
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