Never take over a conversation and DOMINATE it. We have one guy who did this routinely and it became habit such that another guy started picking on him. Turns out the latter was kinda the shop bully and it was all in good fun but for newbies this can be a turnoff.
NEVER assume by a person's dress who they are. I wear a kilt and into kinky erotic romance. But I'm as much a BOTL as the next guy, just willing to share and experience and share my experiences. I've only had this happen in one shop here in Oakland and I never went back. The folks at Grants however have treated me like a respected customer.
Lastly, Sincere Loyalty will get you very far with your tobacconist. Grants changed the lounge policies back in August, shrinking the lounge to two chairs instead of about 8, required a minimum purchase of $25 before patrons could smoke and sit. When I went in one day after policy change to grab a Padron at $10.50, the owner said "Sascha if you want to have a seat and enjoy your cigar, there's an open chair."
It clicked in my head why the policy change and what "I" needed to do to support my tobacconist in San Francisco. Btw, the policy went from 2 to 5 chairs and the minimum purchase went from $25 to $15, finally to going away altogether. And the guys at Grants are very helpful/friendly.