I'm not quite sure why I have a responsibility (or anyone else in my congregation has a responsibility) to make it clear we are not followers of Richard Spencer or part of the KKK.KKK, neo-Nazis, and white supremacists running around with Tiki torches, Swastikas, and KKK paraphernalia, carrying automatic weapons and wearing body armor ... those people ARE haters. If we want to tell people that we are not haters, we'd better be really clear that these people do not represent us, and we'd better demonstrate our love in action, not just in words.
As conservative Mennonites, we don't carry (semi-) automatic weapons around, other than perhaps a hunting rifle during hunting season. We don't wear body armour. We don't wave any flags around, and any tiki torches would be confined to the back yard.
As far as my own congregation goes, this weekend there will be a lot of visitors due to a wedding during the church service. I don't think it would make any sense if the groom got up and announced he isn't a white supremacist or a neo-Nazi; the fact he is not a white person should be enough of a statement that as Mennonites we aren't about that.
I don't think we have a responsibility to really go any further, and continuing to talk about it (or talking defensively that "we aren't like this other group of people") basically makes it sound like we have something to apologise for. We don't.