Even though open carry may be legal....
There are a couple of potential pitfalls, other than underinformed LEOs. And they can happen without any action on your part, other than just being there, carrying openly.
Although different states use different language generally the two issues are called "brandishing a firearm" and "disturbing the peace"
The "brandishing" charge usually requires some form of agressive behavior, such as pointing the gun at someone or something, or generally waving it about. Now, you would not do this (at least without a valid reason) but you might be
reported as doing it, by someone with an agenda, either against you personally, or against the principle of open carry. This can cause a bit of hassle for you, even if when the cops show up your gun is holstered and you are calm and reasonable. If the caller says you were doing it when they called, and you (naturally) say BS, then the cops have to decide who is telling the truth, and they could decide against you. If they do, you must comply with them, including submitting to arrest, but you do have legal recourse. If the decide the caller is lying, they will go after them for filing a false police report. Either way, it is likely that you are going to be detained until the situation is sorted out.
The other situation can be even more sticky. Suppose you are minding your own business, walking down the public street, carrying openly, and some idiot yells "He's got a gun!" People start running, maybe fall down, get hurt, panic ensues, maybe even someone runs infront of a speeding motorcar! The Horror!
In a perfect world you would not be charged, or if charged, would be exonerated, as you did nothing to disturb the peace, it was the idiot who yelled "he's got a gun!" who caused the trouble. BUT, we live in a far from perfect world. Be prepared for a big hassle, if you exercise your legal rights in an area that is not used to seeing people exercise their right to be openly armed.
You can also use the argument that your carrying a gun (in a completely legal manner) is a political statement, an exercise of your First Amendment rights. Just as burning a flag is legally protected speech, your legal carry could be as well. This might even go over better with some people than claiming a 2nd Amendment right (that they don't happen to believe in). I'm no lawyer, so this advice is worth what you pay for it, and it would be a wise move to have an actual attorney advise you on whether or not it is a valid argument before attempting to use it, but it makes sense to me.