I mean this kind of a perfect example of doing the thing where you blow shit up over an extremely pedantic issue which is at best tangentially related to the core ethic, specifically because you view nuance itself as a threat. As far as purity tests dissolving into self parody, I'm not sure there's a better example for veganism.

And I say this as a person who otherwise sympathizes with vegans, but often finds them insufferable. Self awareness is the vaccine to self parody.