boomer double down
When a baby boomer doubles down on something they know is wrong so that they don't have to face the possibility of being wrong. Often relating to technology. Seems to get worse the older they get. Possibly a sign of early dementia.
Terry pulled a boomer double down as he insisted that Firefox was his search engine and his browser was Google. He just wouldn't listen to reason, probably because he knew he was wrong and wanted to avoid looking stupid.