If a middle aged white woman is exhibiting racism then I would call them out as a racist, not a 'Karen'
If a middle aged white man is exhibiting racism then I would call them out as a racist, not a 'Trevor'
If a 16 year old white girl is exhibiting racism then I would call them out as a racist, not a 'Lauren'
If a 19 year old white man is exhibiting racism then I would call them out as a racist, not a 'Matthew'
and so on...
Surely it's the behaviour that defines the issue, these people are racists.
Giving them different 'labels' to define them doesn't help in dealing with the problem. And where do you stop? How many new labels for each sex/age/demographic of racists are needed?
And what is the guarantee that anyone even understands what a 'Karen' or a 'Trevor' etc actually is? I mean, there's no agreement here, so there isn't going to be with the UK public either.
Racist is fully understood. Racists are abhorrent, shunned, condemned. I say use the correct term, 'Karen' or any other label simply waters down the accusation.
(Trevor and other names picked as random examples)