There is a difference between banning people because you aren’t interested in their ideology (I mean by ideology, the way to apply communism) and banning people because they are racist or fascist.
Most people on this website probably couldn’t give a proper definition of anarchism and still judge it.
(I never seen so much closed-minded communists elsewhere than this website)
Imagine creating a lgbt community on a homophobic website. In deed there would be a ‘lgbt’ section, but it wouldn’t be a very welcoming place surprisingly.