I mean, divisiveness for its own sake is bad - I wish more people felt like we were 'in this together' more of the time instead of engaging in identity politics

I mean, divisiveness for its own sake is bad - I wish more people felt like we were 'in this together' more of the time instead of engaging in identity politics about which group deserves what. So I see where the point is coming from, but it's not a totally content-free argument to make, to accuse someone of being divisive. It doesn't mean they're wrong, but calling someone divisive could be a valid criticism in its own right.