Why is it considered by others to be a bad thing, to see women as lesser and to keep them down, just because they're women?
Let me give you an easy out here, and tell you my assumptions. I am assuming it also only took you a minute to look up the definition. And after reading it, then couldn't come up for a reason for others to judge that kind of behavior.
I am kind of stumped of how to actually reply to this, to me it is just pretty obvious that any kind of prejudice or bias like that is strongly unwanted.
Since you keep asking the same, here's some reading for you as well. It's not worth my energy to reply if your just going to ignore that and repeat your question. Best of luck.