It's just VX envy. Just the sight of the VX makes them feel inadequate so they think if they can beat it, maybe they'll feel better. I get the impression that some Liberty owners actually think that 3.7L badge of theirs means they're quicker than us with our 3.5L badges.
My boss is a Jeep fan and he overheard me talking to someone at work about rally suspensions. I think he just caught the "suspension" part and erroneously assumed that I was talking about needing a better suspension for regular off-roading. He came in and said "Get a Jeep!" Well, I'd have been offended but I don't think he even knows who's driving what out in his parking lot. He's a nice guy and if he knew the VX was mine I don't think he'd have said it. So I had the natural reaction to the comment first (I laughed) and explained that the VX is already very adequate in both departments.
Joe, that was a hoot when you had to yank that Beetle out of the deep sand at Daytona Beach. :-)