Gab may have a large number of alt-right conspiracy nuts, but they also have a lot of users who rightfully mock those nutty people. It really is a platform for pure free speech. Unfortunately, its polarization was inevitable as Twitter and Reddit started cracking down on far-right users, leaving only pure free speech websites left for the crazies. But suggesting the website itself condones violence or sympathizes with neo-Nazis isn't accurate.

Per tptacek's comments, the founder does appear to be an asshole, but that doesn't make him a neo-Nazi.