Who knew Alex Trebek was a trash talker?
The "Jeopardy!" host blasted a contestant in Wednesday's show because of -- get this -- her taste in music. Check out the vid ... Alex gave her full-on Trump treatment.
BTW ... the woman is Susan Cole, a legislative librarian from Bowie, Maryland. And she scorched the competition ... taking home a cool $22k.
Who's laughing now?
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