Why as men do we think we will win a argument with a woman not going to happen

It isn't about winning an argument as much as having a successful relationship. Seriously, you do not compromise with a 50/50 chance and be successful. Go for a more practical 95/5 chance and be firm and choose your 5% wisely.

I mean, really how much crap in life is really worth arguing about anyway?

Happy wife, happy life...