Hey Ditz I agree with you, and without a doubt the best way to deal with it is humour, otherwise one day you might go SNAP!!
I can remember when a prior employer (may it R.I.P.) had this tragic idea of serving fruit as a snack on busy MEL - SYD - BNE legs between lunch and dinner. I'm sure you will all agree there is a limit to how attractive you can make a banana on a tray look, but when one woman took a look at her offering and in disgust told me to take the offending item and stick it up my @rse, I laughed so hard I had to walk away. And you know what, my reaction cut her more deeply than any whitty retort.
Most of the pax I cared for were fabulous and it was my experiences with them that made the job so great. But I had my fare share of tossers and looking back I think i enjoyed deailng with them even more.
I don't think any of you should accept inappropriate comments or being made to feel servilently compliant just because a purchased ticket is paying your wage. To do so is to pave the way for continued disrespect towards others in the service industry. Whatever happens just keep your sense of humour and don't let them ruin your day. And dont forget your CS/FSD (or whatever they are called now) are paid the extra dollars to deal with these clowns if you dont feel you can.