rube-aphobia
n. The fear of appearing unsophisticated and uncultured.
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2004
A better strategy is to "be proud of what you do, grow it," Hill said. "Avoid rubeaphobia."

That's a word he coined meaning the fear of being thought a rube for not chasing every new economic development trend.
—Avrum D. Lank, “Speaker Encourages Chicago Manufacturing Seminar Not to Fear Science,” The Milwaukee Journal Sentinel, May 02, 2004
2000
I can't decide. Is good taste or chronic rube-aphobia at the heart of the opposition to the Kansas City CowParade?
—Mike Hendricks, “How now on cows, Cowtown?,” The Kansas Sity Star, July 19, 2000
1998 (earliest)
Still, there is a real context for Mrs. Clinton's remarks that goes beyond Arkansas to one of the more pervasive, if little-discussed, maladies of American life: rube-aphobia.

The term, which was first bandied about in Texas in the 1980's, does not refer to fear of bumpkins and hicks, but the opposite: the fear that unless you have the approval of the media powers and taste makers in Washington, New York and to a lesser extent Los Angeles, you're treated like a bumpkin or a hick.
—Peter Applebome, “It's Not Called Arkansas for Nothing,” The New York Times, August 16, 1998