A friend of mine had a 'corona party' where everyone invited was required to dress up 'like Mexicans'. Because get it? Coronavirus? Corona the beer?! lol!
I said from the start I wasn't comfortable going because I knew the exact kind of shit they'd be wearing. It wasn't an authentic and genuine celebration of Mexican culture and food or whatever (I don't think the guy has ever mentioned Mexico to me in his life). It was obviously just gonna be the shitty tropes and caricatures you see on Cinco de Mayo in the US etc.
I always maintained "Look, I know you're not doing this to be offensive, but it's also not genuine and I wouldn't feel comfortable being there and taking part." I never suggested they were evil people, just that it wasn't for me.
Anyway, for weeks and weeks, they mocked me for overreacting. They said "It won't be anything offensive" and that I should lighten up. Then, the weekend of the party comes and goes and I see a bunch of photos go up on Facebook. The costume of the couple hosting? Mexican drug cartel lords. Fucking lol.
I'm not sure what to suggest, really. It's England. We're miles behind on this shit. People still dress up as 'terrorists' (always Muslim-looking, of course) and actual paedophiles on stag dos and think it's fine.
My non-attendance became a topic of conversation among the whole guestlist and I'm still made to feel like I was overreacting by not going. In the end, I know I made the right choice, I'm glad I didn't go, and I know after 30 years of social progress, they'll look back at those pictures and think "Eeesh, fuck, that was bad. Rory was right.".
But in the meantime, if your partner doesn't go, she can probably expect to be ridiculed and have people talk behind her back about being a 'snowflake' or something.