What you can and cannot say on xbox??

That would be inappropriate

And not for what you think

Common USE common sense it's really not that difficult

Look at the first line LOOKING FOR GROUP

not rant about random things

The only thing you can post in looking for group is looking for group related things PERIOD

Afraid not. The US Constitution only states what government can and cannot do. The First Amendment states that the government cannot do anything regarding what you say; it says nothing about what a private business can do with speech on its platform.

I say, I say, I play tomorrow say I.

"What say you?" makes me cringe when I hear it. I'm not sure why?

^^^Good thing I said "what say you" and you made a typo