If McKinnon presents something that shows why Martina is incorrect, I'd listen. If she just yells "transphobic!" repeatedly, I'll continue to assume she doesn't have such an argument to present.
I agree there are very many people who react this way. You'd think that most people would react this way, actually.
Because it's a rational, reasonable independent thinking approach.
But there are several reasons why people don't react this way. The first one is fear. There is an element of you have to agree 100% with the most ridiculous nonsense - or you're a bigot.
There is genuine concern over being called a transphobic bigot. People have been fired, ostracised, and of course threatened and actually hit, on that basis.
The second reason is that trans lobby groups have trained the police, universities, the NSPCC, sporting bodies, and the government. And there is a misconception that is woven throughout, as a result.
Hence where there is a distinct lack of arguments, people say but can't you just be nice, because it's not fair. That holds absolutely zero water as an argument, but you will be amazed how often it's used.
I do think, however, that many people are looking at this erupting in the media and concluding that Martina is right.
They're not coming out and saying it, though, are they?
You have to wonder why.