Using kindness as a weapon creates incentives for people not to respond to kindness.
Also, as people pointed out in that thread, using kindness as a weapon is usually just being patronizing. The problem with showing contempt for someone is that you have contempt for someone, not that you’re showing it, and focussing your efforts on the showing part rarely fools anyone and is considered worse for very good reasons.
Using kindness as a weapon creates incentives for people not to respond to kindness.
Also, as people pointed out in that thread, using kindness as a weapon is usually just being patronizing. The problem with showing contempt for someone is that you have contempt for someone, not that you’re showing it, and focussing your efforts on the showing part rarely fools anyone and is considered worse for very good reasons.