"...trying to comprehend what he means..."

It seems to me that he SAID what he means, and he said "liberals ARE xxx.."

"Don't you think it's possible for someone to call himself a "liberal" (and really believe he is one) while simultaneously behaving in ways that violate the true principles of classical liberalism and unwittingly behaving in a prejudiced, authoritarian, and deeply bigotted fashion?"

Well...yes, I certainly do... but that is not what he said. He did NOT say something like: "I have seen many liberals who are careless & inconsistent...blah, blah, blah..."

What I read was a blanket condemnation of anyone claiming to be a liberal....and you know quite well how I react to expansive generalizations.

"It mostly has to do with who gets to tell other people how to live their lives.
You mean, as in suggesting that homosexuals should somehow be investigated, controlled, and condemned because of some vaguely mentioned 'study' in Sweden and because of certain dubious 'statistics'?

It is not me who is telling anyone how to live their lives...unless suggesting that they refrain from doing exactly that to others makes me guilty!!