Why do people love/praise the ones that treat them like shit?

I've been trying to look at things from other people's perspective and I still don't get it.

People praise and kiss the ass of people that treat them like shit and then treat the people that treat them with love and respect, the same way the people that treat them like shit do.

I don't get it. Maybe they think they deserve the treatment or it's what they're used to. The treating the good ones badly doesn't make sense though

Why do people love/praise the ones that treat them like shit?
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