But surely imagining that receptionists husband in her underwear is a funner path to self-preservation?

In any case - it doesn't mean that she WANTED you to feel bad or crap just because she was mean. She may merely have been having a bad day.
If it's not about you (and it probably wasn't), it's not about you.
Why not speculate in a more positive way. It is out of the realms of possibility that once she gets home tonight and unwinds a little that she might think 'geez, I was a bit rude to that poor lady on the phone today' and feel bad? Or resolve not take her bad mood out on customers again next time, to try harder?
OR EVEN this - what if 2 mins before your call she got some terrible news? In which case a snotty attitude wouldn't seem so bad in the scheme of things. Feel me?

More like FC's thread - you need to take the ego out of it. Of course you would feel depressed if you thought everyone wanted to make you feel like poo, so why assume that? Are you that important that people go out of their way to crap you off? Or could it be a brief moment in time that someones manners slipped?

On one hand you say 99% of the time there is something behind the meanness that's not related to you, so why can't you leave it at that? I'm telling you - it's easier!