I'm finding that too many 'experts' have big heads and pea sized balls (if you get my drift) and I wouldn't think twice about 'upsetting' them. He probably gave you some valuable pointers on your slide release and open carrying while he was at it. I'm an old codger myself and don't care who I piss off but I piss on nobody. I wouldn't give that 'expert' another penny and scout out a new one. Find one who gives you options and says, "do what works best for you", the guy who's ways are better than anyone else's isn't worth a second look.