Ron White -- Selling Jim Beam to the Japanese is UN-AMERICAN!

You know you're a redneck if ... you swear to give up drinking Jim Beam and Maker's Mark for selling the company to a Japanese liquor brand -- which is exactly what comedian Ron White is doing.

The "Blue Collar Comedy" legend tells TMZ ... he's vowing to NEVER DRINK Jim Beam or Maker's Mark again -- after Beam Inc. (which distributes both) announced Monday it'd be selling the company to Suntory in Japan.

Ron explains, "It’s a goddamn shame! There’s not too many things American these days…hot dogs maybe, and bourbon. But them selling outside the United States is disappointing."