Dan PopcornDate of publication
Title : How I Met Your Mother - Christmas
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I am 100% certain that the word Ted called Lily started with a "C". You'd have to be really sensitive to be that offended by anything less, even if it was one of your best friends saying it. The gang have used words like "bitch" in joke with each other, as well, so I don't think they consider it to be that bad unless it is used in hate, and even then Lily would be more offended by Ted betraying her than the actual word if that was the case, yet she is shown to be offended by the word.
It can't be anything worst than the most insulting English swearword ever - everything else would be a big overreaction, unless you had a personal emotional hate for any lesser insults (which Lily is not shown to have with "bitch".)