1. pH is a measure of the [H+] aqueous concentration. pH = -log10[H+]. Vinegar has a pH of 2 to 3. concentrated HCl can have a negative pH. That DOES NOT mean that the acetic acid in vinegar is a base that reacts with HCl. And what you are claiming would imply that a more dilute solution of vinegar would react with a stronger solution of vinegar which you should understand is absurd. (While acetic acid can be protonated, it requires a strong acid to result in anything other than a very minor/inconsequential equilibrium i.e the hammett acidity function of protonated acetic acid is -6.1) Bases are substances that accept protons. That is not the same thing as having a higher relative pH than something else. i.e acetic acid vs HCl or concentrated Acetic acid vs dilute Acetic acid.

2. The purpose of my comment has not to list every single example of gas producing reactions. Carbonates, bicarbonates, sulfides and sulfites are the major bases that result in a gas being produced on reaction with a suitable acid. The gen chem courses that Ive taught have a lab that was designed to teach students among other things, that carbonates and bicarbonates react with acids to produce a gas. (CO2) Sulfides and sulfites are not as suitable for that lab due to the production of H2S and SO2 respectively.

3. The paper you linked to (which you should actually read) discusses the contents of ear wax as being primarily fatty wax like compounds not the carbonates, bicarbonates, sulfides and sulfites that react with acids to form gases.

I am a chemist (and biochemist). You are not sharing "cool chemistry facts" you are sharing misinformation due to your lack of knowledge of the subject you are talking about. You would do well to revist a lot of the topics discussed in gen chem. Chemistry libretext articles on bronsted-lowry and arrhenius bases would be my recommendation.