This just isn't true. This site is extremely GC - but you won't find another place IMO that is more pro boys/men wearing whatever they like, boys having completely free access to any and all traditionally girls toys and challenging almost any other gender stereotype there is.
The problem people have on here isn't with challenging gender stereotypes, that is absolutely applauded on here. The problem is when people start to conflate sex and gender. Gender can be whatever you like, it's a concept, a social construct made up by people and generally based on stereotypes - feel free to challenge and mess with that in any way you like. But when people think that because they can play with gender they must also be able to change sex - and so they're not just dressing like a woman but actually becoming a woman - then that is a problem. It's a problem because sex is binary and changing sex is not a biological possible not matter how much some people want it to be. It then potentially leads to biological men in women's prisons and changing rooms and biological men's crimes being recorded as crimes by women.
I also disagree that most people on here who think what is happening in Palestine is wrong are anti semitic. People are able to separate out what a Prime Minister does from what the average person does/thinks - we have to be able to do that in this country with the list of horrendous PM's we've had! The attacks on innocent Israeli people by Hamas were absolutely horrific. But the response has also been horrific. Completely innocent people on both sides have been treated appallingly. It's just all a very tragic situation.
The problem comes when groups of people say 'If you don't agree with every single thing we want then you're transphobic.' Or 'If you don't agree with every single thing the Israeli Prime Minister does then you're anti semitic.' There are plenty in of moderate people in both groups NOT saying this, but it's those that are that are generally the problem IMO.