My old person trait is that I think 'ghosting' is completely unacceptable and you owe the other person a face-to-face conversation.
Two spaces after a period is my eccentricity as a writer.
It's not even legitimately gained by being that old...I had a crush on this science teacher and HE was old enough to use two spaces. So I did. And 20 years later I still haven't shaken it.
The only good thing is that nothing else legitimately uses a double space, so find and replace is quite easy.