I don't know enough about him to have known that. Even so, some people do have petty personal stakes in culture wars and being not a chud in one front doesn't mean he can't be a chud in another one.

Maybe he does actually like eating there, felt personally threatened by criticism of that particular consumer product, and took it upon himself to be a righteous guardian of it because he's got Main Character Syndrome and no one is coming between him and his meme sandwich.