I remember what got people upset about snowdin! It wasn't particularly a guilt by association thing. I don't remember what specifically started the chain of events, but something something snowdin user gets called out for being racist, person doing the callout gets dogpilled on, and then ensuing fediblock posts. Snowdin seemed to have a reputation of being wholesome on the post-pleroma side of the fedi, and they obviously really wanted to protect that, massively overcompensating in the wrong direction
I have no receipts for this myself, for what it's worth. It's probably lost to time now that snowdin's shut down, so you're more than welcome to take this with a grain of salt.
I feel like 99 percent of the time I see stuff like this go down it's more or less the same recipe. People generally do not respond well to being called out. We get very defensive. And, of course, seeing people get defensive when you call them out in and of itself can be very triggering, since that's when things start to escalate, as it did with the snowdin user
I thought about joining snowdin.town
before coming here, but I remembered seeing that chain of events and idk. It just seemed like the community handled it so poorly. But otherwise, they all seemed very nice.