Well, if she deliberately singled out this specific group to appeal to certain voters, then it makes perfect sense to be angry about it. In principle, it's no different from racists or bigots targeting minorities and blaming them for society's problems.

I'd guess that's exactly what's happening here. She could have simply said "men," which would have been a truthful statement. Instead, she specifically said "white cis men," which is a blatant lie.

It's the same tactic as blaming everything on immigrants or Roma people. You know what your voters already believe and what they want to hear, so you tell them exactly that. You reinforce their prejudices to win their support.

It's Horseshoe theory again and again.