[pogo101]

Yeah, why are "tabernacle" and "chalice" dirty words there?

Is this some Freudian thing (in that the words now refer to a woman's and man's private parts, respectively)?

[GMMAC]

"... why are "tabernacle" and "chalice" dirty words there?"

Not "dirty" - blasphemous.
Up until the 1960's, French Quebec was likely one of the most universally devout Roman Catholic societies on the planet. Although it's backslid an absolutely incredible distance over the last couple of generations, misuse of any religious terms (blasphemy) remains much more of a social taboo than what we'd consider profanity.

Au la belle province, sacrilege continues to trump vulgarity.

[-YYZ-]

They are all words associated with the Catholic church, and up until the middle or so of the last century, Quebec was a place where the Catholic church had a very strong hold. So by using those words in that context, it was very much a profanity, in the true meaning of the word.