Not withstanding that this has turned into an entertaining thread, and after my various ironic/insightful/snide/rude (take your pick) comments and disregarding the merits or lack thereof of the Beatles, it finally dawned on me what irked from jump:
If you're about to make a comment that starts conceptually with "I don't get it", don't bother; you have nothing of worth to say on the subject and all you'll do is expose your ignorance and sound silly to those who do get it.
Opera sucks
Richard Pryor isn't funny
Soccer's a stupid game where nobody scores
I mean, why?
Rule of thumb: if something is valued/enjoyed/studied over an extended period of time by a large number of seemingly sentient beings and its appeal eludes you, you can't necessarily help it but I would eschew boasting about it.