I like a lot of vegan cuisine but the illogicality
Of expecting everyone to adopt your particular idea
Of what being healthy is, is just preposterous

from Immortal Technique – Beef and Broccoli Lyrics on Rap Genius

Meaning

Some vegan food may taste good, but it isnt healthy to eat all the time. Vegans expect everyone to be vegans like them.

I think he’s actually just saying that it’s stupid for people to shove their idea of healthy down others' throats is illogical, because healthy can mean many different things to many different people. The next line is where he starts to talk down on the vegan diet as unhealthy.

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