I assume they are speaking about Elon Musk, who used 'Free Speech' as a reason for his wanting to reform Twitter. Specifically that they 'censor' people too mu

I assume they are speaking about Elon Musk, who used 'Free Speech' as a reason for his wanting to reform Twitter. Specifically that they 'censor' people too much or 'censor' the wrong people. The person remarking about 'free speech' loudmouths is pointing out the irony that people like Elon who go on crusades of free speech advocacy do not practice it when it comes to things they don't like, don't agree with, or which have the potential to harm them in some way. This is because the article mentions that the writer made a joke at Elon's expense personally (handed him a card with a cartoon showing him breaking a twitter figurine in a shop) and then got possibly fired because of it. That's my take on it.