A general heuristic that is useful in life is that if someone is foaming at the mouth and shouting, the things they say probably aren't that useful. (And you definitely come across like that. EG someone scanning the text would see "_PATHETIC_", and would assume that the emotional part of your brain has been engaged rather than the rational part).
The use very early on of "All soda is UNEQUIVOCALLY bad for one's health!", probably put a lot of people off. It is trivially hard to refute (any example of any soda providing any health benefit (eg rehydration) proves you wrong), and again makes it seem like you are making illogical, emotional arguments.
The use of "Anyone who reads the whole thing, and still downvotes, is someone with their head in the sand" is a cheap nasty trick that will turn people against you even if they agree with you.
Try waiting until you have calmed down and rewriting it in a better way.