Experiencing social consequences for saying something people disagree with is not infringing on your freedom. Unless they band together and try to go further than simply not liking what you have to say, how is that stopping men from saying their opinion on 4chan?

Independently, I wouldn’t call 4chan a liberal place. As far as I know, 4chan started and participated in activities in the past that go far beyond simply not liking an opinion. They doxxed, harassed and threatened people, among other things. And with support from many people on that platform.