Do adults still say , "children should be seen and not heard?"?

My father used to say this to me when he had friends over. It didn’t hurt my feelings because I thought he was only halfway serious. And part of me thought he was trying to teach me manners (not to be blabbering away when adults were talking). It’s not that I think many parents give a flip about manners now but do they still say , “children should be, etc?”