I just noticed something about me, and I am wondering if this is a societal condition. When addressing in shorthand a male, referring to them by their last name is acceptable. So Biden, trump, McCarthy, etc. When referring to women, it is Hillary, Ivanka, Nancy, etc, and only adding the last name if you need to distinguish between Nancy Reagan or Nancy Pelosi. I feel it is somehow disrespectful to refer to a woman by only her last name. But I don't seem to have the same feeling about referring to men the same way.