I think that it's because (not that I really have much experience with this, but...) Americans tend to be less forgiving when people incorrectly identify others. Here, everyone seems to be more accepting of people wanting to identify themselves outside of the 'norm,' so when someone -- let's say -- mis-genders someone, the assumption is just that the person didn't know. It's not about it being an intentional, personal attack.
As a result, I don't think it's quite as big of a deal here as it is in America, you know? That's just my guess, anyway.