Sure you could get sneezed on in a store. Hasn't happened to me yet in the past year and a half, but I suppose it's possible. At the distances I maintain from people in general, even pre-COVID, it's not much of a danger.
I think it would be much harder to avoid something like that packed into a stadium with 100,000 other people all shoulder to shoulder.
But also, I'm vaccinated and not particularly worried about it. The vaccine does a far better job than the mask.