This is clearly spillover from SH. I have seen some god awful abuse toward FJ over there. FJ himself has pointed out that WK was one of the perpitrators. Therefore, I really don't blame him if he has banned him. Doubt the posts in question would have got the same response, had this history not existed.
I think it is a lesson that we should all have some respect for others, be it in person or on social media. Slighting others in the public domain has a habit of coming back at you!!