Why are people so mean towards ugly people?

Also, why is everyone on this site, so mean in general? I recently posted some of pics on howdoilook asking for advice and feedback on my looks. Most replies I got were very negative.. No one even bothered telling me what makes me unattractive and how to fix that. On the contrary, almost all other girls get tons of replies and everyone is kind to them. You can be honest without being a jerk
Why are people so mean towards ugly people?
Post Opinion