Pigmy rattlesnakes have bitten four shoppers in stores since 1987. We don't know why pigmies prefer Walmart, it may be the low prices or it might be an artifact of low sample size. In each case the snakes were in the garden section. We don't find it surprising that these snakes get into garden sections of Florida stores. They feed on lizards, including brown anoles, which are often very common in plant nurseries.
Pigmy rattlesnakes' typical reaction to a human, when closely approached, is to remain motionless.
A snake in a potted plant is likely to stay in it even if the plant is grabbed and moved by a gardener.