Yeah, that would be a deal breaker for me.
I once dated someone who made a Facebook post (after we broke up) about someone cutting him off in traffic and how he threw pennies at their car
Looking back I see so many signs that that was not an isolated incident- where he would get mad at small things (never at me though)
When I saw that post I was like "Thank God I dumped him!" because being that aggressive while driving is a serious sign of immaturity (at best) and rage issues.
Sometimes I still think of that Facebook post and laugh at what a giant bullet (or penny, I suppose) I dodged.