They're not just saying they should be heavily scrutinized. At least some are saying that it's flat out bad science to acknowledge the differences, or perform research into the subject at all.

They're denying science for ideological ends. It's pretty much the same thing as conservatives with climate change. They don't like what science has to say, so they're trying to shut it down.

I'm generally pro-feminism, but no 'side' has a monopoly on bad opinions.