Vurtle,
Your posted scenario is not unique to Texas.
I live in the country in Ohio in the middle of the woods. Seeing people walking around here toting long guns is an everyday thing. Seeing people run up and down these country roads on ATV's or tractors with long guns in scabbards or slung over their shoulder is no big deal either. No one even gives a second look. Hearing people shooting at targets around here is as common as when I lived in the 'hood' and the gangs shot at each other.
But I assure you that if one were to go in town and walk into the bank or a store with a long gun, they would be met with a different acceptance. Even if everyone in the bank in town lived out here where I do and used to seeing it out here. Why? Cause it's just not normal behaviour.
There was once a thread here on TFL in the Hunting forum talking about pro hunters versus anti hunters. And what pro hunters sometimes do that unnecessarily aggravates the anti hunting crowd.
The subject came up about hunters being on a hunting trip, shooting a deer, field dressing it and later, going in a restaurant and sitting at a table without washing up first. Having blood all over their clothes and up to their elbows. I remember sitting reading the thread and while most posters agreed that this should not be done , a few of the posters commented trying to defend actions like this and a few just took the stance that other people in the restaurant should just look away if they didn't like it.
In other words, the attitude of:
"I don't care if actions like this may hurt public opinion of all hunters. I'm not breaking any laws , I'm gonna do what I want and screw whoever doesn't like it".
In the general publics eyes, that attitude hurts all us 'barbaric' hunters and is the same attitude that was taken in the Starbucks scenario which,in turn, hurt all gun owners as well.
It's all about common sense and respect for others in which there surely seems to be a lack of with some in the gun owning/hunting community.