I didn't read the whole thread but I think he's a PSV football club Eindhoven (soccer) fanboy and they are always quick (like most "Ultra" sides in Europe) to call anything or anyone even remotely unlike themselves "gay" or in Dutch "homo", and specifically in Holland use "kanker" ('cancer') as a derogatry adjective and "Jews" for Ajax (Amsterdam football club), since Ajax was a very jewish club when it was started and still is in many ways.
Ajax supporters use the nickname "Jews" sort of as a badge of honor btw.
For instance somebody can say "that fucking cancer Jew from Ajax is a cancer homo" in the stadium and nobody around would bat an eye. They also just to sing a lot of stuff but they get fines know. (When one coach' wife died of cancer whole stadiums were singing "Louis van Gaal has a cancer wife" just a few days later).
Now I'm not saying Daan is doing any of this but I seen posts of him supporting PSV a few times and considering how accepted homophobia is in soccer I would be surprised if he thinks this is normal in society. He doesn't strike me as the sharpest knive in the drawer.
Personally I think it's a dumb post/meme that is not even funny (the right can't meme, as they say on a different social platform) and a dick move towards queer team mates and fans (as well as short sighted if he wants to keep those sweet coorporate bucks coming in.)
I love his skating and he should go out and film that SOTY part he still has in him.