Coming in late to this one, but I have been thoughtfully following it.
The more I read here, the more that I concur with those who say to "own it," and to have a conversation with Hortense. This is absolutely the time to cut this creepy guy from your life. If Hortense decides to be affronted, then she will just be hurting herself and limiting her social life.
Years ago when I was young and na´ve there were two different men we knew who wanted to hug me against their chests. This never happened when my DH was around, of course. I still feel annoyed and taken advantage of, that they each managed to do this several times for whatever cheap thrill it gave them.
I still have great regrets that I didn't call these guys out on their behavior. They knew exactly what they were doing, as does Horace. You have a chance to stop some of his nonsense, and I suspect that you will regret this in later years if you don't. If you are disgusted with him now, and I love your picture of showering with a wire brush, just think how angry you would be down the line when he says suggestive things to your teenage daughter.
PS We gave the cut direct to one of the chest hugger guys. My mother was married to the second one, so that made the problem more difficult. Fortunately, they moved out of state and we only saw them several times a year, and my children were always included in those visits. That made it hard for the old goat to get me alone, and I was on my alert by then, too. I never told my mother, because I felt that it would really hurt her feelings, and that if she confronted him he would accuse me of misinterpreting a kind gesture. Sound familiar?