This doesn't fall under compliment, but it was funny... We were on a trail run with a group of Jeeps and there was a TJ with two girls behind me & my family in our JK, and a single guy in a JKU behind them.
At one of the stops the girl was sitting on the hood of her TJ talking to me and the guy from behind them. He mentions the plastic grill on JKs, and how she probably wouldn't be able to sit on the hood of his. She looked at me and says, "That has a plastic grill?" I joke, "Yeah, that's why some people say they aren't real Jeeps!" She says without missing a beat, "OH, I thought it wasn't a real jeep because it has 4 doors." I thought it was funny. The other guy, probably not so much....