I bottom-post if the other person do so first. That almost never happens these days. I guess if too many do it like that then no one will be the first to bottom-post, even when both would prefer that. Not sure what a good solution would be that did not involve confusing random other people with bottom-posts.

I remember around the time top-posting had taken over, someone on a mailing list being upset about having their mail cut up and quoted inline by someone else. Can imagine today many might react like that if they ever encounter nicely formatted mail replies.