This is a complex and nuanced topic, so I'll give you a short answer that gets right to the point, followed by a longer answer that goes into more depth.
Cake's mission is to enable great conversations, and we're not interested in being a platform for hate speech or harassment, because those things are the opposite of great. So if someone's idea of "free speech" is "speech without consequences", then Cake isn't the place for that person.
Speech has consequences. If I compliment you, that makes you feel good. If I insult you, that makes you feel bad. The US Bill of Rights says that the government can't pass a law that says I'm not allowed to insult you. This is a great thing — not because insults are good, but because regulating speech would give the government too much power over its citizens, and that's incompatible with democracy.
So, if I invite someone over to my house for dinner and they start ranting and raving and insulting me, they haven't broken any laws. They've exercised their right to free speech. But I'm probably going to ask them to leave my house. That's not illegal either, because the Bill of Rights doesn't guarantee that someone can come into my house and speak to me whenever they want about whatever they want. I'm not the government, and I own my house, so I get to set the rules there. And I don't want to spend time with people who insult me.
Cake is like a house. We're inviting people in and encouraging them to hang out and talk to each other. But if someone comes in and starts making other people miserable, we might ask that person to leave. We can't stop that person from going somewhere else and making people miserable there, and that person has every right to say whatever they want in their own house, but we want our house to be a friendly place.
That doesn't mean that everyone on Cake has to agree with each other, or that everyone even has to like each other, but we do expect everyone to respect each other. When posting in someone's conversation, behave as if you're a guest in their house. When starting your own conversation, behave as if you're a guest in Cake's house. 🙂