The first sign of Reddit going to shit was around 2015 when a bunch of tweens (and then their soccer mom moms) started posting.

The soccer mom moms were first checking to make sure it was a safe site, since Anderson Cooper had recently at the time said it was a site for pedophiles. Then they liked the site more than the kids and started to become mods. And these communities were way bigger than their Facebook groups, and the mods had way more powerful buttons than on their Facebook group. And then sub banning became the preferred method of disagreement rather than downvoting (which was also originally not supposed to be used to express disagreement.) anyway I digress.