So this afternoon I stopped by a LCS (local convenience store) to grab a snack on the way to my daughter's 4H event. When I entered the checkout queue, customer 1 (older white male) was finishing his transaction and continued to banter with the clerk. Impatient customer 2 (middle-age white male) said something when customer 1 left, which agitated the security guard (middle-age black male). When customer 2 finished his transaction and started leaving, the guard became engaged in an extended escalating swearing match with customer 2 that seemed to be building to an incident. Fortunately after a bit, while I was at the counter, customer 2 seemed to had enough and left the property. The clerk recognized my displeased facial expression and apologized under his breath that they have no control over the guards. On my way out, I calmly told the guard he need to do better and must set the example for conduct. Of course, that was not well received, including the "Call my boss and get me fired. I don't need this job..." refrain. He is the kicker- the guard was armed (interestingly with a Gen 1 Ruger P95) and displaying an RTD Security badge (with photo) on his gun belt. Bottom line up-front is the this individual is an unstable hothead and does not have the temperament to be armed security at convenience store. I have already been on the phone with the local PD (who are stopping by) and RTD (why is somebody moonlighting with your badge displayed?). Thoughts? Yes- I know they are scrapping the bottom of the barrel to hire for these positions and yes, it may not have been smart of me to admonish an armed asshat, but sometimes the old Army O3 just comes out.