Nothing

If you do troll all your girlfriends, please stop complaining about being forever alone

Or, OR...it's a good way to weed out the ones with no sense of humor.
Btw, I'm so sad I never thought of that. :(

Well, you actually have a point. The unfunny ones will dump a guy on their ass right away. The only problem is that most girls in love completely forget themselves and turn into lovesick puppies. most, not all....