Just because no one ever says anything about open carry to the person doing it legally does not mean they did not have negative thoughts they kept to themself; after all, you already have the "whatever" to walk around displaying a firearm, people may be understandably reluctant to speak.
If concealed carry is legal, and it is here, I just silently think WHY.
IMO it looks like the person has something to prove / chip on shoulder.
Some places are typically safer than others, but criminals are mobile and may show up in a typically safe place without notice.
Strive to always carry the gun you would carry on the "bad" side of town.