It’s not that any of this is good or bad. It’s not that it matters too much to people. It’s just that some people are like this. Some people may always be like this. Of all the characters you interact with on a daily business, there’s someone that has this problem. Maybe it’s that lady who smiles near the bread, maybe it’s that quiet bearded guy who is staring down as he walks into the store – or the greeter, smiling while looking you in the eye as she welcomes you.
Your idea of relaxing might have a built in level of safety, where you don’t have to keep an eye on things. Or it might mean that feeling of safety when someone else is around. Or it might be that constant watching of the entrances and exits.
And then there are people who don’t have that level of relaxation. Their calm is wired tighter than Cher’s chin. When you’re comfortable, they are but at a different level.
It wears on them. It would wear on anyone. And when it does, they react in different ways.
Don’t tell them to relax.