PDA: Inappropriate behavior

I took my father to a doctors appointnent one day last week. A couple, in about their late 60's, had walked in just before us and sat down the man was using a walking stick but it didn't look like he needed it. The woman was walking with a cane. We say down across form them, facing them. This man reached over and tried to pinch the womans nipple! She just giggled and pushed him away. People all in the waiting room were looking at each other stunned. He did this several times and I know it made everyone there uncomfortable. After doing this several time I spoke up and said "don't you think what you are doing is highly inappropriate!?" He said "you're just jealous". I said " no, I'm not, I'm embarressed for you though". He looked at me and said" wouldn't you like to my girl friend out?" I said " I wouldn't take her to dog fight if she was winning!" The rest of the people in the waiting room cracked up laughing. The couple never said or did anything else.