I can immediately think of sites that are open to gender critical discussion. Voat, 4chan, and many other message boards exist for such. It isn't a topic I'm particulaly interested in, but if you start there I'm sure you can find more spaces where that type of discussion is accepted and embraced.

"Freedom of speech" isn't freedom to force private businesses to provide a platform for your content. There are plenty of businesses besides Twitter that will provide a platform for the type of discourse you are looking for.