Basically anything that the person in front of you's either favourite hobby horse or biggest blind spot is you can't talk about it.

For some it's trans, for some it's Islam, for some it's Corbyn, for some it's class, for some it's race, for some it's pro-Israel, for some it's anti-Israel, for some it's even great swaves of ideas like culture or biology which are unmentionable without a full screaming tantrum.

They really have just become completely intolerant and bigoted.

I remember when tolerance meant actually liking human beings and having patience for their quirks and differences. Now the left seems to think hating most people and having patronising sympathy for some imaginary people they will never meet thousands of miles removed from them is tolerance.