How to serve someone there own medicine?

When I get in an argument with someone aka a guy, I go quiet bc I rather let them just rant about whatever, bc why waste energy on arguing but when I go quiet they say "your to sensitive" or "your in your feelings" when in an aspect Idgf bc it would be an argument over the guy talking about a woman and how he sleeps with them and etc. When he's in a relationship and I keep telling him stop bc one it makes me uncomfortable 2. It's not attractive and tbh no one cares, but we end up arguing bc he can't deal with what's right and wrong cuz he's a moron, so how do I serve him the next time he starts with me his own medicine?
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And when i do say something like congratulations on sleeping around and flirting with woman I hope it really boosts your ego he goes defense and says this is why I can't talk to you
How to serve someone there own medicine?
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