I have give the Cut Direct just once in my life. It was at a multi-period battle reenactment festival; I was strolling around checking out the Athenian hoplites, the 15th-century artillery and the Crimean lancers, when suddenly I realised the next group was a bunch of Waffen-SS. I was revolted. I can cope with people re-enacting WWII Wehrmacht, but SS . . . no. Just no. It doesn't make any difference to me whether they are Nazi sympathisers in reality or just enjoy it as a fantasy; either way I can't be doing with it.
So, I had quickened my pace to get past them ASAP, when I realised that one of these guys was hailing me by name. I looked and realised that I did know him slightly from Napoleonic-period reenactment. I just said 'I don't know you. I don't want to know you.' and kept going.
This was a wholly instinctive reaction: I hadn't time to think how best to handle the situation. But I still think it actually was the best. No way was I going to greet and chat to someone in that uniform, and there was absolutely no point stopping to spell that out, because, frankly, if you need to ask why people shun you when you're dressed as an SS man, you aren't going to understand or accept the answer! And if he had attempted to justify or explain his hobby (and from my small acquaintance with him, he was the I'm-always-right type who probably would), I would have said or done something a great deal less civil, quite possibly something actionable in law.