“Chemicals” in food. Literally every substance, every food and people are composed of them. The common usage has bastardized the meaning and latched on to the naturalistic fallacy. Snake venom is natural. Cyanide is natural. Arsenic and Uranium are natural. Botulinum toxin is natural. Something being naturally occurring does not automatically make it good for you just as something being made in a lab does not equate to being bad for you.
On one hand I agree with you, the way “chemicals” are used in everyday speech differs from the text book definition.
On the other hand, if we take our heads out of our asses and stop the "well actually"s I kinda have to agree with being against “chemicals” in food. Arsenic is naturally occurring, sure, but at what concentration? Radioactive uranium is a naturally occurring element, but I would hardly call nuclear fallout something natural.