Usually insecure people call me stubborn, because they cannot accept that they are wrong. My disagreement/insistence on my own opinions must be a character flaw, and not the logical flaw in their argument I pointed out in detail five times already.
Security means you can change your mind if you need to, upon seeing valid data. Being right means you don't have to. A reputation for stubbornness may the insecure kind or simply be other people being threatened. It all depends.
....insecure about where to eat? Or about themselves?
Defensiveness in the face of perceived criticism maybe. Or a standard introvert thing - hundreds of invisible (because you didn't state your contrary opinion/need) compromises being made, and the ones you don't make (which are noted because you actually say/do something) being resented. The stubbornness of "goddamnit, the one time I actually cared enough to state my opinion out loud - I let them decide the rest of the time!" perhaps? Plus an awareness that certain tiring things, things that take more effort, social things, are bigger compromises for one party and factorig that into account. Not an SP though, so I'll leave the rest of the speculating to them.