It seems that these were cases of blatant racism. But for the sake of the argument, if the cases were comparable, someone else doing it as well does not make it right. Whataboutism. We can disapprove all of all cases where people get detained unjustly.

Replace "blatant" by "implied" and yeah.

There was no mention of any race being inferior to any other in these posts.

The court guessed that this was the man's true belief. Same with the student that got expelled from the US for implying he supports Hamas.

This is not whataboutism: the original comment I replied to was precisely about Brits being afraid of the US government on free speech.