The opposite of strawmanning is steelmanning:
You know when someone makes an argument, and you know you can get away with making it seem like they made a much worse one, so you attack that argument for points? That’s strawmanning. Lots of us have done it, even though we shouldn’t. But what if we went one step beyond just not doing that? What if we went one better? Then we would be steelmanning, the art of addressing the best form of the other person’s argument, even if it’s not the one they presented.
If you know of a better counter to your own argument than the one they’re giving, say so. If you know of evidence that supports their side, bring it up. If their argument rests on an untrue piece of evidence, talk about the hypothetical case in which they were right. Take their arguments seriously, and make them as good as possible. Because if you can’t respond to that better version, you’ve got some thinking to do ….