Like it or not, there are two kinds of guys who carry.
Type 1 is a normal person, wearing normal clothes, acting like a real human. This guy doesn't seem threatening to anyone. He can usually pull off open carry with hardly anyone even noticing.
Type 2 is the guys you see walking around wearing all manners of "tactical" garbage, peeking around corners before proceeding, and while they often have some technical firearms knowledge, they rarely have any practical firearms knowledge. These guys wear combat boots to the library. They try to dress and act like law enforcement. Truthfully, they scare the h3ll out of me, and don't provide a very positive image of gun owners. These people, in my opinion, do more harm than good for gun rights.
Type 2 is the guy who is noticed, and the guy by which we are all judged by the general public. I've ran into a few guys who made me reconsider for a split second the soundness of the handgun carry law. I've met several people from this forum, and none so far would fall into this catergory.