#9 A unmannerly prick
Manner, manners. Girls like a guy who knows his manners. Now every guy should know his manners *though he should never push it and become the sensitive guy*. But that’s not it at all. There’s something even bigger.
You should be man enough to apologize or accept that you’re wrong. No guy’s a bigger sore loser or a turn off than a guy who just can’t accept his fault, but would rather throw tantrums and make a fuss and pout like a four year old. Learn to man up and remember, accepting that you’ve made a mistake is not a sign of weakness.