When you insult something that is part of ones persona, you are insulting that person. Soda is an awful thing to compare to something that someone has spent a decade of their life expressing themselves with.
If all of what you've written is in earnest, then you've just insulted many soda lovers.
That said, the solution isn't to walk on eggshells around every topic that anyone could possibly have identified with. The solution is to be very, very cautious about making anything so much a part of one's persona that a stranger's critique of that thing feels personal.
