Because, dingus, that's what the general audience does on social media with attractive characters. All of the love on the internet for Loki is because "he's hawt" that doesn't take away from his well layer portrayal in 3 films. Same with The Doctor, or Sherlock. All popular characters with huge "their hawt" followings. Just because people comment on looks doesn't mean they only like the character for said looks or can't look beyond to how the character is presented. You're general audience thing is so beyond weak. The GA rarely looks beyond the surface of ANYTHING whether it's plot/character/symbolism etc. That's why they are the GA. I'm not insulting them, not everybody needs to love and dissect films, but most people watch movies for a simple escape and entertainment and never take the time to really assess things. They want the surface thrill, the surface emotion. 
I could easily turn your argument against you. What does the general audience say about the Joker outside of "he's crazy and fun?" All they do is say "Heath Ledger was awesome" and that's it. You don't see them commenting on the meaning of the character and what his role in the narrative plays on a thematic level do you? No, I thought not.  It's all "The Joker is crazy wicked insane!" Nothing more. Does that mean there is nothing to the character? No, of course not. What does the GA say about The Matrix? It has insane action. That's it. They don't go into the philosophical miasma of the plot, just the cool factor. I could go on and on.... 
 
You didn't read the six articles I linked/quoted did you? Articles analyzing and assessing the character? I've never seen someone so blatantly ignore things right in front of their face just to further their weak argument.