I didn't even know this was a thing, but caring passionately how many spaces people put after their sentences is borderline OCD. I'm going to start using double spaces so I know who the crazy people are.
My grandparents taught me to use "Oxford commas" and double spaces after sentences when I was very young. To me, it looks better on paper that way. I never thought about it until I had a psychotic teacher who actually deducted points for my writing "1, 2, and 3" instead of "1, 2 and 3".
It inspired me to make it a point to include these more archaic practices in my more formal writing. And doing so always flushes out a few grammar lunatics.