I've never talked to an Arch user about Linux, so I dunno how toxic their community is. But I do read Arch documentation, and it's fantastic. Arch's documentation has (for me, anyway) taken the place that used to be held by the old HOWTOs back in the early days.
The kind of cooperation required to accomplish this doesn't speak of a toxic community to me. I didn't watch the video since I don't watch YouTube on my phone, but I'm guessing it's not the Arch community that has issues but annoying teenage "I'm more 1337 than you" jackwads that are the turd in the Linux punchbowl. Those little cretins are drawn to distros like Arch because they like feeling superior to the "normie" users.
I should know, I used to be like that thirty years ago. Most of us grow out of it after we start getting laid.