OK, but anti-Semitism and white supremacy aren't the same thing (black nationalists can't be anti-Semites?), and even if they WERE the same thing, how is this an example of "actively courting white supremacists" or anti-Semites for that matter?
Let's tie it back to the original argument. It is basically argued that unlike Twitter, it's justified to deplatform Gab because their 465,000 users are "virtually everyone" white nationalists, white supremacists, and/or anti-semites (the terms are used interchangeably), and that this state of affairs is due to Gab "actively courting white supremacists".
Does Gab actively court white supremacists to join their platform? Maybe! The poster claims that he screenshots Gab as a hobby, so it should be easy to provide an example of this.
Words have meanings. "White supremacy", "White nationalism", and "anti-semitism" are not synonyms.
There are very specific claims in the original argument. "Actively courts white supremacists" is a higher standard than "holds or expresses white supremacist opinions", and this claim is central to the argument justifying deplatforming Gab.
I don't think any of us want to litigate the fine details of where anti-Semitism becomes white supremacy, but, if you take the time to go read Ken White's Twitter feed, you can find Gab mocking White for adopting non-white children.
Anyone who denies that it is anti-Semitic is obviously arguing in bad faith.