Insult her friends, family, upbringing, or all of the above. Especially when you’ve never met them or been anywhere near where she has grown up. I know, I know, she talks about them all the time. But that’s the point… they’re HERS to talk about. If you aren’t even dating yet, your input (if it’s negative) is not required, desired, or appreciated.
Insult her other candidates. Or tell her that she doesn’t know what she’s doing by considering her other candidates. This just makes you look petty. And if you were the top dog before, you will immediately become her least-favorite choice. If you are lucky enough to remain a candidate at all.
Turn everything into a debate. Or try to edge perfectly normal conversations into hot-button issues. You’ll find out eventually whether you agree on things or not. There’s no reason to start arguments right off the bat for whatever motives you have. If debates are how you normally interact with your friends, then don’t treat her the same way that you treat your friends – she doesn’t want to spend every second of her day on eggshells, hoping she doesn’t have to argue with you about politics, religion, or what kind of chicken is the best. Women don’t want men who are argumentative.
Be a know-it-all. You don’t know everything about everything. It isn’t possible. Pretending otherwise, especially when she proves you wrong, or when she knows you’re wrong but doesn’t feel like debating it (see above) makes you look arrogant. And ridiculous. And unattractive.
Move too quickly. So you think she likes you. Awesome. She probably does. But that doesn’t mean you jump in with both feet, start inviting her to meet your family, all your friends, and start talking about what you want to name your kids. Slow it down, buddy. We get it. You’re excited. But if you move too quickly, you’ll look pushy, you’ll scare the shit out of her, and she’ll stop. Or, at best, she’ll slow it down for you and you’ll wonder wtf happened.
Don’t listen. Or, listen and then don’t remember what she said. Or, listen, don’t remember what she said, and then blame your failure to remember what she said on the fact that you’re a man. Your gender is not an excuse. You’ve essentially just told her you are not interested enough to give a shit about what she says. That’s about the stupidest thing you could do.
Tell her you aren’t sold. She won’t know what you’re talking about. And it’ll make her feel like a car salesman on top of being stupidly confused.
Bring your kid to the first date (or second date). I don’t care how well behaved your kid is. I don’t care how old your kid is. She doesn’t need to meet your kid right away.
Openly compare her to all of the other women you are currently seeing. It’s nice to be open and transparent. It’s nice to be honest. We like that. But comparing her to the others is not making her feel any better and it’s making you look like an inconsiderate man-whore.
Make us wear the pants all the time. In the day-to-day world, most of us are forced to take care of ourselves. We have good jobs, we have our own housing, we make our own money. Not all of us, though, want to wear the pants in our relationships – at least not all the time. We like input, but if we’re more of a badass than you are, if we are constantly the ones pulling out the weapons when the security alarm goes off, if we’re constantly saving your ass, or if you’re the one crying at chick flicks while we sit there and laugh at you, you’re not doing a very good job of selling yourself.
If we’re in shape, if we exercise regularly, if we go to a lot of trouble to make ourselves presentable, you should do the same. You don’t have to be built like Superman (though it helps), but don’t be a fat-ass. Take care of yourself. Go to the gym. Exercise. Make an effort.
The opposite end of the spectrum applies, too. If you’re so scrawny that we could kick your ass in a fight easily, that’s not attractive either. It just reminds us that you’re probably too effeminate to ever be taken seriously.