Misogyny
Racism, homophobia, far right views are things that would immediately end any association with him.
Tightness or excessive preoccupation with money. Ime that's a very bad sign.
Any sort of indication of jealous or controlling traits.
Aggression towards me or others in any form.
Saying negative things about other women in particular ones they have dated.
Preoccupation with gambling (I wouldn't mind the odd scratch card, but anything regular or involving online casinos etc would be an instant killer)
Preoccupation with gaming. Again dont mind a casual interest but anyone very in to those things would not be for me.
Love bombing in the early days of getting to know each other... consider it a very bad sign.
Any interest in hunting animals.
Obsession with sport or fitness would put me off... I wouldn't mind a casual interest in those things but if they were his main focus in life we really wouldn't have much in common.
And I personally would not be able to deal with someone being away for long periods of time so no oil rig workers or soldiers etc for me.