It’s ok to laugh at satire of racists 👍

There's no "shouldn't have" here. We can laugh at these things. This was a joke about how badly JKR writes foreigners, not a joke about the race it depicts.

There are good and bad jokes about racial stereotypes. Are we making fun of Mexicans or are we making fun of racist peoples' stereotypes about Mexicans? I'd argue this joke was the latter.

And to be fair, not all of those are equally bad. Seamus Finnagan and Anthony Goldstein could very well be real people. The other two are so much worse, especially now that you've made me realise the slavery connection.

About Cho Chang though, she actually looked up the meanings and choose Cho because it meant butterfly. I've never really associated that character's name as a play on the racist stereotype, being Oriental myself. I've just associated it with general western ignorance.

As abhorrent as she is now, she was a queer ally but just didn't understand trans, like many people around her age and demographic. She reacted to the massive backlash and drove herself into the weeds.

She's horrible now and deserves all the hate but know that she's a result of our own making. I think if any new people express a misunderstanding, it's far better to make a bridge to correct that misunderstanding. It takes a lot on our part, trans and trans allies, but I'd rather make a friend out of a fool than a foolish enemy.

Which is also amazing because she is simultaneously a target herself for being muggle-born. To the point that she had to erase herself from her own parents memories.

Meanwhile in the real world, bigotry is still common among oppressed groups. See also: racism in LGBT communities, self-hating Jews, Catholics/Protestants, close-the-border 1st and 2nd gen immigrants etc.