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I still find people who do this
(slrpnk.net)
At my last job, a bunch of the older folks did not realize they had a "two spaces" habit.
It's a clear tell.
Saw this meme and thought I'd point that out.
My 33 year old husband does this. He went to an extremely rural school and they taught him to do this in computer class in high school. Drives me insane and it took me years to convince him it's not correct any more. He works in an industry where most people are older so I guess nobody really notices or cares.