I see your point that the quality of discourse is very low and that most ideological labels are worn haphazardly without the wearer really understanding what philosophy he/she is claiming to support.

Many sloppy "pro business" kinds of people claim to be libertarians but they really want a lot of government intervention in some markets and not others. This is just an example of typical hypocrisy and not proof that people who actually do support libertarian philosophies are like that.

The problem is you're looking for ideological purity, and such a thing doesn't really exist. Poll everyone who identifies as "libertarian" and you'll find that almost none of them meet your standard.

So then what is the point of using the label the way the OP did?