I think this would be a good feature on the site, but regardless, I like this as a personal rule:
Zap at least 10 sats before replying to a comment. Even if it's something you staunchly disagree with, you have to zap the comment before you reply.
If something isn't worth a % of 21 million, it's not worth typing a response. If something seems worth a discussion, it's also worth a few sats. It's like a respect signal.
I think if this were a site rule, or even an unofficial community rule, the number of pointless debates would go down (not that there are a lot on here anyway, especially compared to social media) - probably because replies cost sats anyway - but I think zapping the commenter directly takes it to a different/more intentional level.
Happy Monday boys and girls.