It's entirely possible to be accepting and understanding of individuals, while still disagreeing with the larger social groups and movements they are a part of. In fact, pretty much everyone does that in some way or another every single day.

The thing I take issue with is the knee-jerk reaction of certain people to shut down any conversation that suggests traditional roles and definitions were and still are valid.

Yes it's simplistic. It was a one line statement. Is it dismissive? Maybe. But it also has a grain of truth to it, which is what bothers people.