Reddit could always be aggressive, and if you search up the OP it looks like they went into a passionate community and stirred it up.
They didn’t deserve this level of vitriol or the lack of elucidation though. That’s definitely gotten worse over time. Part of why I left was how aggressively immature it had become, to the point where you couldn’t have normal conversations there anymore.
Going into any passionate community and dissenting for the purpose of dissenting is outright flamebait and nothing more.