What are some signs he is a douche bag? For example rape-y, cheats, self obsessed?

for women, We are great at spotting crazy’s among ourselves that men might not notice right away. I’ve heard that men are also great at spotting complete dicks that maybe women have a hard time realizing until it’s too late. What are some subtle signs that a man might be not just an ass hole (cause a little of that is kinda hot) but a human piece of shit.
What are some signs he is a douche bag? For example rape-y, cheats, self obsessed?
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