I can use the exact same activist rhetoric and "theory" to prove *any* and all costumes are offensive. It's like MadLibs, you just fill in the blanks at this point:

__________ is oppressive to __________ due to ____normativity/supremacy 

There is an incredibly vocal minority of unreasonable, high-conflict people looking for any excuse to "call out" others. How much do you placate them? Where do you draw the line and finally say, "enough"?  What is your personal line? The more you cave to their demands, they more they will demand. Every.single. time. When people start dragging children into it, and are so fragile that they think a *child's* costume is somehow denying or erasing their culture and is oppressing them, then I know my line has been violated. They are children having fun, not making political statements. The personal is NOT political.