“The first person to tell their opponent ‘you shouldn’t be so sensitive’ forfeits the debate.”
There are of course exceptions. But obnoxious people think that every time they say something offensive or awful, the onus is on others to make allowances.
I believe my rule prevents more bad arguments.
But I’m not actually trying to engineer a debate ruleset, I’m mostly pointing out how people try to get away with being assholes.