You may be forgetting that Reddit was built on the same 'shit'. A huge portion of the real content of Reddit was porn and other repugnant topics. The admins of the time faked a huge portion of their posts to form communities around them.
My experience, having actually used Voat, is that this is not the case. I've engaged people in the /v/gaming, /v/programming subverses and everyone's been friendly and polite to me thus far.