Allow me to put things into context:
The lady initiated the conversation, not me. She asked me my opinion and I gave it to her. It wasn't what she wanted to hear. She's entitled to disagree with my opinions and if she wanted to, she could have spent her period of stunned silence to changing the subject, or maybe smile and nod in mock agreement. That's what polite people do. Instead she chose to use a VERY dehumanizing method of communication. She chose to speak to me in a rude manner and told me to turn around so she wouldn't want to continue facing me and ordering me to not speak. Again, this lady was entitled to disagree with me, but there were better ways for her to have handled it.
I had seen this series of TV shows which displayed how it was to realistically live in different periods of time. ("1900 House", "Frontier House", "Regency House", etc.). It was an amazing trove of culture and manners and mores that we in the current era may not often know about nor understand. In "Manor House", the setting was an English manor house set circa 1910, with an "Upstairs/Downstairs" type setup. The maids, when dusting were expected to go about unnoticed whenever possible during their duties. In fact, if a member of the Lord's family were to be walking in the hall while the maid was dusting, she was expected to turn around and face the wall until the person passed. No talking or interacting with the person. You were furniture. That is how that woman made me feel. She in a derogatory snooty tone told me I was furniture, that I and my opinion (which she asked for) didn't matter and shouldn't be spoken. I cannot abide by that.
As for my remark about her endangering herself should she risk insulting the wrong person, I meant it. I didn't hurt her nor threaten her but I was pissed! I know enough to hold myself back. There are a lot of people who don't. My dad (one of the best observers of human behavior you'd ever meet) taught me that some people are crazy enough to put someone on the floor for what that woman did to me. One day, her snooty behavior will get a bad reaction from someone who was not as restrained as I am.