Bedrockgames
I post in the voice of Christopher Walken
I mean at the end of the day its a joke about ageism (lol those old gamers and their gatekeeping in D&D), which I suppose is on the low end of "groups not to make fun of".
I am a grognard, starting to feel old. I don't particularly mind people making fun of grogards or old gamers. I don't think it is a moral issue at all. The only thing I like is for humor to be funny. This didn't land with me, at least as described (I am sure it may be different if I read the actual entry). So I think the humor could have been done better but I don't think it is some kind of sin for them to gently prod Thac0 in this way (and presumable prod those of us who cleave to the old ways).