"Strong side" is a technical term commonly used by people who train those who carry firearms. It refers to the dominant side. Most people are right or left handed. The "strong side" is the considered the dominant side. Right side if you are right handed, left side if you are left handed.
The use of the phrase in this context simply indicated to me that the man is familiar with the terminology used by those who train people in the carry of firearms. He has probably had some formal training.
Absolutely correct. And, it should be noted that (with the exception of cross-draw configurations (like a shoulder holster) most holsters are designed to be worn on the "strong side".
Further, citizens who take competent courses in handgun use and the (very serious) responsibilities of being armed, are often required to learn to use their "weak side" hand for shooting -- as a survival tactic when the "strong side" is injured or immobilized. (And that is not easy...)
The writer was addressing a forum of knowledgeable, like-minded folks, (on opencarry.org) so he used "insider shop talk shorthand" to covey (to his peers that he was seated such that his sidearm was readily visible.
raybbr & imfleck, your projection of your own emotional inadequacies by attributing nefarious motives to another citizen is most unbecoming of FReeperdom. At the very best, it shines an unflattering spotlight on your ignorance and bias.
Okay, what he's saying is that he sat perpendicular to a table in a restaurant with his gun hanging out. No, he wasn't be provocative.