I think the comment about not being a cop was for your benefit, not to imply that you'd become big-headed and on a power trip. I think he was just trying to drive home the point that you need to be very aware of when it's acceptable to shoot and when shooting makes YOU the criminal. You come home to find a man exiting your back door with your jewelry box...not ok to fire
Based on the rest of his post, I really don't think he meant any disrespect at all. I think he just wants you to be safe.