There's a discussion going on on the Dutch football subreddit about a non binary person playing with a women's team. The team won a match after which their opponent filed a complaint.
I again had some discussion with some nerds who immediately went that trans women should not belong in women's sport with the standard arguments, you know the drill.
The best were the comments from redditors saying they (the NB person) shouldn't be allowed because they might feel like an NB, but biologically they are still a man.
Which brings me to the best part: the person was born a female, wanted to transition to male and then found out they were non binary instead. So, there is absolutely no advantage for them. But Redditors won't even read an article which clearly stated this and instead give their expert advice anyway.