as a teacher myself it was completely unacceptable for the pupil to film and then put this online.
When teachers are willing to throw pupils out of class for stating an unacceptable opinion, then that is vastly more unacceptable than a student wanting to protect themselves and have evidence as to what exactly was said. He has the video, he can show that he was polite, and what exactly the stated reason was for him being ejected.
There are either only two genders (if you think gender is inextricably linked to sex, or just being used as a synonym for sex), or an infinite number (if you think gender is more about personality).
This is akin to kids being kicked out of class for stating they don't believe in god, and the 'inclusivity' appealed to here is akin to saying -- 'yes, we know you're a devil-driven atheist, but don't cause trouble and say so 'cos it upsets the religious kids, and you're being non-inclusive if you keep shoving your unacceptable opinion down our throats.....'
I'm still stunned by how quickly it has become unacceptable to say anywhere that your opinion of your gender is only that, subjective opinion not objective fact. Because inclusivity and being 'nice'..............
It's an infantile way to try and sort out how to organise society where there are always going to be conflicting rights and conflicting opinions, whether that is the significance of gender, the meaning of woman (sex or gender), the reality of god, the ethics of homosexual acts, but just trying to prevent the problematic belief being stated 'cos it upsets people, whether that is 'there are only 2 sexes', or that 'my religion says homosexual acts are a sin', stopping people speaking is not the solution, pretending or trying to make us all pretend we agree is not the solution.
Thankfully some kids are still stroppy enough to kick-back! Well done!