For me it would be not having their own place, car, job, right off the bat. I’m not a kid so guys my age should have these things. They should also be single and not married or in the process of a divorce.
I also would not date a drinker or a drugger or a drug dealer.
Or someone that is on probation.
Or a guy that doesn’t pay child support.
If they say they hate their ex that is a big red flag. Someone mentioned having anger issues and mental instability.
If his family did not like me. If he didn’t like my faith. I once had a guy tell me he hated Catholics not knowing I was one. That was the end of that date.
If he says he is a commitment phobe then I believe them and don’t bother.
The biggest deal breaker for me is if they bad talk people, their ex , parents, siblings, boss, I know this guy isn’t for me. That to me says ‘loser’ faster than anything else.