Just want to make clear that my argument was never "freedom of speech." That is only in regards to the people's relation to the government. It's more that the as consumers, they can criticize what they pay for in any way they want.
For example, if the WWE were paying people to go to the shows, then I would agree that they shouldn't chant such a thing. But since it's the other way around, they're just going to have to suck it up. If an employee of WWE was chanting it and they got fired for it, I'd support the firing.
Honestly, the best way for this to go away is to ignore it. People who don't like it should stop talking about it. WWE employees should not mention it at any time. Wrestling journalists and wrestling YouTube channels who do not like the chants should stop doing videos about why people should stop it. Because the more it's talked about by those who don't like it, the more it will continue to happen. People are naturally antagonistic to a degree.