There is no space between the last letter of a sentence and punctuation.

Please , please , make it stop !

Related, we have modern word processors with kerning. Only one space at the end of a sentence! I always find+replace when folks send me documents to publish with double-spaces.

Don’t get me started. I write really long documents for a living. While I don’t see this issue at work, when I encounter it in the wild, the vein on the side of my neck starts throbbing uncontrollably. Unfortunately, I’m married to a person who thinks the double space at the end of a sentence is a good thing.

Alimony is too expensive, is it?

Double-spacing was taught into me when I was taught typing and I'm never stopping!

Someone also probably taught you that pineapple on pizza was also acceptable. In both cases, they were fucking wrong! :D