This is a private enterprise and Wong's own right to free speech is affected here. It is his forum.
Suppose you owned a printing firm and the KKK came to your firm and wanted you to print up a bunch of racist leaflets for them. Do you think you should have the right to refuse such business if you didn't want to help send out that kind of message?
Now the KKK has the right to spew its filth, but no private enterprise has to help them do it. The same principle applies here.