I dated a Klansman once
Hold on a minute, I didn't know it at the time. He was gorgeous, gentlemanly, chivalrous, and treated me like a lady, bringing me flowers and doing whatever I wanted to do on dates. He opened doors and called me "M'lady." He was no 'brain dead loser', he made good money and was basically a smart and interesting guy. I had no idea what he was until he took me to their meeting house. It was a plain old white house, never suspected a thing. He called it a 'lodge'. He took me upstairs and showed me the secret meeting room. It had no windows, and a circle of seats around a cross with red light bulbs on it. He told me I was the only woman who had ever seen the inside of that room. There was nothing shocking about that room, but downstairs in the kitchen they had a bulletin board with some very upsetting literature on it. I couldn't believe what I saw. He invited me to a rally, and I went and stood way back (next to some Chinese girls!) and watched. I saw them burn the cross with gasoline soaked burlap. They didn't really make any racist speeches, but they did hand out 'literature' and took donations in, I kid you not, a plastic lard bucket with the label still on it
He was there, robe, hat and all, shades on under the eye holes.
Yes, I did feel differently about him after this. But I was afraid to break up with him right away in fear his 'friends' might trash my parents' house or car or something. So I went to the movies with him once after that, but refused to go back to his place with him. A few days later he called me up and asked me to go to a jamboree in Alabama and stay in a hotel with him. I outright told him I wouldn't go, and wanted to stay away from the Klan. After that he was cold to me so breaking up came naturally. But it was an interesting experience. You just never know who they might be.
The worst thing was, he told me they sold fruitcakes at Christmas under an assumed name, and that blacks were some of his best customers. That was sad