Went to the link and I’m not seeing it. I mean, I saw the video but don’t get what the controversy is all about. This was part of the Beatles schtick back then. I believe they did a concert at the Royal Albert Hall around the same time in which John asked the commoners to clap their hands and for the royalty to “rattle their jewelry.”
Who cares where it was, it was cruel. You didn’t get the way he moved his mouth to sound like someone who was retarded, and the way he held his hands and buckled his leg, imitating someone who was handicapped? Quite possibly, you need glasses or new ones if you currently wear them.