I mean this in the nicest possible way so please don't take offense. How long have you worked for hun? You seem quite new to the business....don't let things like this get to you. I get are you Scottish questions constantly - it's because there are so many foregin ladies in my town that they want to confirm it, that's all. It's nothing. What I'd also respectfully suggest is that by asking how many escorts they have seen offering whatever it is, you are instigating a sex chat. This question opens the door for them to answer in all sorts of ways that we would find inappropriate.
I also agree with Helen and Amy that it's crazy to tell another client about that.
If you have a bad call, I like to walk away from the phone for a minute, go and make a drink or whatever, then compose myself. When you answer the next call, smile (Amy told me this - it sounds crazy but it works).
There are lots of things about this business that are worse than the odd call for a daftie. Get your head around these, because I'm fearful for you if a call like this is bothering you to that extent.
Hope your day gets better