Honestly, no idea. I think it might be culture barrier stuff or something? Apparently she's from the UK and their fans are boring as shit. The tweets ended up going into some "nationalism can be so nasty" shit which is hilarious, 'cause even if that was USA on USA we'd have been yelling the same stuff. Either that or it was some "its disgusting to be cheering for the pain of others" crap, but if you're obviously not actually dying or legitimately seriously hurt idgaf.
If it was an outfit thing RIP to her ego because I slay 10/10 objectively speaking and clearly without any and all bias.