I am genuinely curious to know why you say that. The other poster didn't say anything about not eathing fruit and vegetables etc. They said:
=> Making a conscious decision to go against biology and select a different dietary preference is indeed an ideology (unless there is a real medical reason you cannot eat something, such as allergies).
I can't see where in that comment the OP said or implied that it "goes against our biology" to eat fruit and veg etc. It's clear to me that what they said goes "against biology" is not eating any meat. That is what characterises the vegan diet: the absence of meat and animal products, not the presence of fruit and vegetables.
So why did you say that eating fruit etc doesn't go against biology? Who said it does?
Did the OP change their comment between the time you replied to it and the time I read your comments?