I think this advise is mostly for people on the dating scene not mental health professionals. You can't exactly ask someone "are you a bigoted sociopath" when you match on Tinder, but you can look for red flags.

This just happens to be a potentially innocent sounding screening question that answers quickly if the person you're talking with is likely an asshole.

Also this is not about whether or not someone likes tofu, but about how aggressively they react to the question

"The texture is a little weird to me so I prefer chicken" is very different from "BLEH I HATE IT"

Also, if they mention estrogen, that's a pretty easy "this guy listens to too much Joe Rogan" flag.