Just a small molecule.

I feel nothing but contempt for those who belittle everybody's feelings as "just a chemical reaction without importance".

Contempt because they commit a wilful phallacy of (at least) self-deception. At worst, to belittle others.

The presence of neurotransmitters is not an argument to ignore them as anything unimportant (in my humble and unqualified opinion), but as MATERIAL BASE, EVIDENCE that those feelings exist.

Just because a molecule is small, it does not follow that its consequences are unimportant, but that they might be unexplored as yet.

A small example. As small as a Na+ ion. Not even a molecule. It races along a myelinated axon at a speed of up to 120m/s. On an unmyelinated axon, it is between 1-4. Change the speed at which it moves by demyelinating. You don't need to. Just look at what Multiple Sclerosis does to people. A small change.

Or nociception. Surely, one of those "intellectuals" would be able to withstand the pain of a broken bone armed with the knowledge of what nociception is, and without resorting to painkillers.

It is, after all, just a small molecule, unimportant.