"You are such an idiot."
Really? Are they? Is someone really an idiot for believing in abortion? Is someone really an idiot being against abortion? No, I don't think so. Your beliefs do not make you an idiot. Maybe you believe something entirely wacked out, but c'mon, seriously? Insulting someone's intelligence or calling them a name doesn't help your argument.
Obviously, I'm not in favor of abortion. But I do not believe those who support abortion are idiots. I believe they are (1) willfully ignorant of what abortion truly is or (2) could really careless because it's just a "fetus" and not really a human (which, btw, humans only beget humans, so obviously it's a living baby inside a woman just as living puppies are inside a momma dog). They believe the woman is more important than the unborn child. At one point, that woman carrying the baby was once inside her mother's womb, making her also unimportant. Why are the unborn less important? I've never been given an satisfactory answer.
Insults and name-calling do not get you anywhere. Can't we all just be grown up and maintain an adult debate? I encourage others to refrain from it. If the one you're talking to insults you, ignore the barb and stay polite.
The former also only hardens them and blocks out what you have to say. And this goes to any and all arguments, not just abortion debates. In debating, stay respectful. After all, you're representing everyone who believes what you believe and if you're being a jerk, they'll label us all jerks. Not cool.
If you're getting heated, back off. Take some deep breaths and rethink your words. Don't say something you'll regret.