"So much of Rivers' career was about mocking others' looks, and I do believe that negativity factored in the decision to not have the lights dimmed for her."
In all fairness, she mocked her own looks as well. She had several jokes about how flat chested she was and when she started getting plastic surgery, she had a few jokes about that as well.
Everybody forgets some of the jokes that Bette Midler used to make about other people. For starters (one of my favorites): Princess Anne, she loves nature despite what it did to her.
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.