Ronin, can we agree to disagree, for I would hate to see you, sanctioned because of your post on this thread. This is a site, dedicated to healing and helping other, will you accept my help, to enlighten you, on what it means to be trans?
The answer to both your questions is certainly yes. Obviously everyone must be treated with dignity and respect regardless, I was making a reference to scenarios such as the one I witnessed in a grocery store when I was working as a cashier. I was serving customer 1, who happen to be the only transgender individual in the very small community. I forget what prompted it exactly, but the next customer in line offhandedly said, "Thank you sir" to customer 2 even though (I think) customer 1 identifies as a woman. After customer 1 left, customer 2 looked at me and, cringing, said, "Gee, I didn't mean to offend," implying that the 'sir' just slipped out and customer 2 realized after the fact it might not have been appropriate.
Growing up I saw customer 1 in the town often but as a child I never once thought of her as a woman, she just looked like an effeminate man to me. So again, to be totally candid, I can understand customer 2's slip.
So that's where I was coming from when I said I didn't think someone calling you 'sir' was something you needed to flip out about.