7. Demonstrating aggressive behavior
If the server brings you the wrong order or someone accidentally bumps into you, going off on them is not going to win you any golden stars from your date. They will conclude that if these little things set you off, who knows how you’d react if the two of you had a disagreement
8. Only having friends of the opposite sex
If you’re a guy who only hangs out with girls, your date will wonder if you’ve got a thing going on with any/all of them. Likewise, if you’re a girl who only hangs out with straight males, that’s not going to make him feel very comfortable.