I've always been a fan of the theory that a little bit of consideration and manners never hurts, particularly when you're dealing with people that you don't know.
Case in point: A lady calls up an SEO company looking for, crazily enough, some web services that likely included search engine optimization! However, when speaking to the nice young man at the front desk who informed her that the person she wanted to speak to was on a meeting call, instead of being courteous, she was a snotty bitch. And then, when she got a cutting reply from the boss, she had an eTantrum at him.
Funny thing about people who use the interwebs for a living, they might just tell other people about how rude you are. All I can say is, Barbara Feldman Realtor, thanks for showing your true colors before anyone invested any time in helping you out.