Do men point put flaws and try to make me insecure because it deflects from the fact all they want is to use me for sex?

They flirt even while taken. And once they realize i won't give them the free fornication they want they start to insult me and disrespect me like a 4 year old manchild.
Do men point put flaws and try to make me insecure because it deflects from the fact all they want is to use me for sex?
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