Oh you're totally correct on the academic definitions. For instance I'm a leftist social libertarian. But I don't tell most people that because when they think libertarian, they think of guys that drive trucks like in the post.

Like it or not, and I don't, the definition has changed in common language.

Just like how liberal now means something completely divorced from the original meaning for the vast majority of people. You can spend all day trying to explain that liberalism actually is a conservative ideology, but people aren't going to stop using liberal to describe people left of the US Democrats.