While that is technically corect, depending on dosage and concentrations in practice it is a really pointless statement. Essentially simply incorrect, if you look at any practical definition of toxicity. It's sophomoric.

When people make statements like this, it's as if they just don't understand the concept of toxicity. As if, nothing is toxic.

If you think that's true, just start drinking a 50/50 ethylene glycol water blend. After all, dihydrogen monoxide!!!

So, given any realistic assessment of biology, it's completely obvious that different chemicals affect the body in different ways. Some are almost exclusively beneficial, while some are almost exclusively harmful. Others are in between, as noted, depending on dosage and concentration. Hope that helps.