I really hate when I have to deal with someone on the phone whose voice dramatically skews from the gender their name would indicate, and unfortunately, I usually find out their name after we've been talking for a while.
When I'm talking to that lady in one vendor's office (usually after I've said "yes sir" or "no sir" at least once), having taken their name at the end of the call to find I was speaking with Belinda, well, I remember that when I call that particular office these days, but will I ever learn, generally?
I have one customer now who makes Dr. Girlfriend sound absolutely powder-puff. This customer was offended by their previous represenative to the point that they asked for their account to be reassigned to me.
I'm kind of wondering if the previous rep was just taken aback, having called her "sir." Still, I vow to not make assumptions, and to do better. I really don't want to offend.