People can be hypocrites and may use all the same kind of generalizations and rationalizations of bad faith they are defending their own group from on different targets. News at 11.
A good chuck of that is different institutions with different cultures and different responses to pressure.
An objective definition of cancel culture will view as a form of actions different group may take part in. Not an ideological that will ever have a consistent list of what it's offended by.
As other said there's more to the JK story than those two tweets that this was months if not years in the making:
https://www.vox.com/identities/2019/12/19/21029874/jk-rowling-transgender-tweet-terf
The court judgement clafifes saying the person she's defending wants to cancel trans people out of women's spaces because then the rapists can get in.
When pressed she simplicity called the trans speaker a sexist deviant:
https://assets.publishing.service.g...l_Development_and_Masood_Ahmed_-_Judgment.pdf (Pages 7-8)
Despite what the OP personally believes about trans brains both maya and JK believe that sex being real means that they're not women and that they're too similar to an opportunistic rapists to not be canceled from women's spaces.
The fact remains in defense against cancel culture y'all just defended a canceler.
To be clear i wish society could be rational when discussing disagreements reasonably and only get offended at correct things. But what y'all just needs kinda leads to a confimation biases that this just isn't in the cards. Our discourse in it's very structure can't allow that to happen.