What do you need a source on? I am not that poster but I am a professional dominatrix and I will vouch that women, including transwomen, tend to have much higher pain tolerance than men. This is pretty well known in BDSM. Note that doesn’t mean women don’t feel the pain - they definitely do. They can just take a lot more pain and for a lot longer time than most men.

As to the other part - duh. It’s pretty obvious a teacher would use any excuse at physical touch as an opportunity to assault a student if he was so inclined. That’s how most predators operate, who get away with it - in the realm of plausible deniability. Predators are always looking for that wiggle room that gives them space to assault while simultaneously denying it. It’s why they prey on children in the first place.