I'm clearly reading the anecdote differently. I'm reading it as the person is subscribing to a moral framework on the playground that allows discrimination.
It being part of a framework where two wrongs even out, still doesn't excuse it. The whole stated excuse says that it evens out.
Also, in that case there is no revenge or compensation or anything, since the second wrong isn't inflicted on the perpetrator of the first one. So even the rationales for when a second wrong might be necessary, don't actually apply here.
It's like saying that if gang X keys imported cars and gang Y keys domestic cars, it evens out. It doesn't. The second wrong neither cancels out the first (just more innocents will have their cars keyed) nor is justice for the first one (it's just more innocents affected, not payback or deterrence or anything.)
At that it seems to me like you're actually committing another fallacy there, namely
Converse Accident Fallacy. You're starting from some special cases where it might be argued that a second wrong might actually solve anything (though even there it is generally _not_ argued that punishment "evens out" the crime, nor that it makes it ok: otherwise we wouldn't need the concept of "recidivist", since any previous deeds would be already evened out and made ok) to a general case that really has nothing to do with it.
Or does it? That's what I'm getting at. My impression is that it comes down to whether the claim is that these are oneoffs, or whether the claim is that it's the way things are at the school.
I'm not sure what you're getting at. If the way things are at that school is injustice is ok as long as everyone gets some injustice, that would IMHO just make it worse.
Moral frameworks can be all-or-nothing. My impression is that the person is defending a different moral framework where discrimination is OK if it's universal, but not OK if it's unilateral.
Moral frameworks, or generally any mental models, can also be wrong or fallacious or whatever. It being a mental model is really no excuse.
This is the same worldview that holds it would be unfair to have men-only clubs in isolation, but if there are women-only clubs available, then the situation is OK.
A club can be argued to some extent under freedom of association. Receiving an unjust punishment from a position of authority isn't even remotely comparable.
Or that it's wrong for the government to support or denigrate a particular religion, but if they support or denigrate all of them equally, then this is an OK situation.
Again, you seem to be making a hash between something which is integral to the freedom of religion concept, and something which is plain old injustice. (If a minor one.) And again it doesn't help that the situation with religions isn't that simple, nor a case of simply wrongs evening out. If a government flat out fired anyone who belongs to any organized religion, for example, it wouldn't be "evening out" but plain old religious persecution and it wouldn't even out at all.
I observe that so many people argue quite strongly that in a scenario like this, the two injustices are obviously linked and not independent. I don't think this is a fallacy so much as a point of view.
See my example with keying cars. The injustices there are linked too, but they don't even out. At the end of the day not many people would look at their keyed car and go, "well, those guys with Toyotas and Hondas are gonna get theirs too, so I guess this is ok."
I think I can agree with you on "IF" the debate is about the first act alone, but I suspect the person is actually reasoning that the two acts in conjunction are OK, but the act in isolation would have been wrong.
In my opinion, the claim is not a logical fallacy; it's simply a weak and indefensible moral framework.
It's weak and indefensible _because_ it makes no logical sense. Otherwise it would be trivial to defend by simply presenting a valid inference to support it. I.e., basically, _because_ of that fallacy.