You've been looking in the wrong direction, the dangers are coming from the Left - read OP

The paradox of tolerance states that if a society is tolerant without limit, its ability to be tolerant is eventually seized or destroyed by the intolerant. 

If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them.

In this formulation, I do not imply, for instance, that we should always suppress the utterance of intolerant philosophies; as long as we can counter them by rational argument and keep them in check by public opinion, suppression would certainly be most unwise.

But we should claim the right to suppress them if necessary even by force; for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols.

We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant. We should claim that any movement preaching intolerance places itself outside the law and we should consider incitement to intolerance and persecution as criminal, in the same way as we should consider incitement to murder, or to kidnapping, or to the revival of the slave trade, as criminal.

The student replies: “If they want to identify as a cat or something then they are genuinely unwell – crazy.”

The teacher then asks the young girls where they got the idea that there are only two genders.

“Gender is not linked to the parts that you were born with, gender is how you identify, which is what I said right from the very beginning of the lesson,” the teacher said.

The teacher added: “There is actually three biological sexes because you can be born with male and female body parts or hormones” and “there are lots of genders – there is transgender, there is a gender who are people who don’t believe that they have a gender at all.”

The students disagreed, telling the teacher, “if you have a vagina you’re a girl and if you have a penis you’re a boy.”

The teacher then interjected, raising their voice to say that while the students may consider being cisgender the “norm” it is not the law.

“You are talking about the fact that cisgender is the norm, that you identify with the sexual organ you were born with. That’s basically what you’re saying, which is really despicable.”

"..for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols."