Group insults do not lend themselves to bright line rules. In discussions all across the Great Debates and Elections there are disparaging comments towards groups that it is clear from past posting history that some of our posters are members of. Insults towards Republicans, Democrats, and libertarians abound and while I personally am not a fan of sweeping generalizations, it’s not something that I’d prefer to moderate.
It is when the attack on a group is inseparable from an attack on a poster where a person can run afoul of the rules. This would be context dependent. I gave an example in post #3 where a group insult would be inseparable from a personal insult towards another poster.
On the other hand, we often have posts along the lines of ‘Democrats are thieves because they want to tax all our money away!’, or ‘Republicans are racists who hate the poor!’. Both of those are childish and add little to productive discussion, but probably not something I’d moderate for personal insults (withholding judgment for other potential violations). However, depending on the direction of the thread, if it’s clear that the intent is to disparage other posters by adding the veneer of the group insult, then that would be moderated. In general I’d avoid sweeping generalizations since they are often false.