Sure, I know it isn't. But it still depends on where in Texas. If you're in Austin, yeah, you're probably not going to see people toting guns in supermarkets all over. If you're in Dallas or Houston, it'll be more common, but still not that common. If you're somewhere like San Antonio or Corpus Christi, it'll be even more common.
But yeah, there are vanishingly few places in the US where you should expect to be in the presence of gun-toting civilians while doing something as mundane as grocery shopping.
Geez, the stereotypes people spread!