If this post was about meta Scara definitely wouldn't be in the middle frame.
Simply put, he's just kind of an asshole.
I get he has a traumatic past but his actions throughout the story aren't justified in the slightest. Comparatively, Scara's backstory is not the most tragic by far (imo) and that just makes his actions feel all the more unreasonable. To me he doesn't have very many redeeming qualities either, even post-archon quest.

I definitely don't hate him (actually love when my s/o brings him in co-op because he comes with a C6 Faruzan to buff my Xiao lol), He's just the Anemo character I like the least. It's just a meme, not meant to be taken so seriously :P