We can’t take advantage of the doormat, for example, by realizing he will just agree to whatever we propose and then proposing a bunch of rules that serve to benefit ourselves at the doormat’s expense; instead, we need to keep ourselves in check by recognizing that there is a disconnect between the way these doormats/assholes are acting and the way a reasonable person would be acting, and only propose rules they’d follow if they were, indeed, reasonable.