Why the need to vent about it and post online? Working in catering, retail you always get arseholes, and you just move on.
Posting about it online is one thing, but retorting doesn't make you any better. Feeling that way's fine, so is telling the husband about it (who by the way is just as bad as hers for allowing the waitress to post this wherever she did and slag off the other bloke for being ugly.) Just don't tell people. Otherwise you're no longer a "victim" if you could even call it that.
Not like she got her leg blown off by a land mine. Enjoy your marriage filled with cruises and paying bills together.