Look, I can't peer into anybody's soul and tell what they really believe; so it's impossible for me to really answer this question in full.

Most libertarians I know are good-intentioned people who disagree about the nature, effectiveness, and justice of regulation. Some are even devoutly religious people who believe that involving the state in moral matters just undermines human dignity and could undermine religious institutions. Some think that all coercion at all levels of society is totally unjustified. I think they're wrong about this but I see the case they make and think they are well-intentioned. A lot of my friends fall into this category. 

There are some who do have a difficult time grasping that we live in a society, though. I think they're a small, albeit loud, minority (especially online). There's a reason why people joke that libertarians are autistic (apologies to the actually autistic): these kinds of libertarians have a hard time seeing the value in intangibles like family, community, locality. These are the types of libertarians who happily say, "just get up and move from your hometown!" and that struggling communities "deserve to die." 

These kinds of libertarians run economic analyses that show that one policy is far more efficient than another and they happily endorse it without looking at the third-order effects of hollowing out communities. Sure, you get a cheaper iPhone and you get to say that your iPhone can do all the things an office did in 1989, but who cares when your neighbors are unemployed and your sibilings are all addicted to heroin? 

These are economic analysis libertarians. Their arguments often have internal coherent sense but lack something that makes them human. These are the libertarians who, when people complain about libertarians having too much power and wanting to hollow out substantive chunks of the country, that they are referring to. They can have a neoliberal mask, a conservative mask, or a libertarian mask on over top. The Trade War brought these people out of the woodwork. 

Overlapping with, but not necessarily identical to this group, is a group of relativistic types who become libertarian as a way of justifying their relativistic lifestyles. This is a not negligble group of people. When I first got involved in libertarian student stuff, I didn't think this would be the biggest reason for Americans to identify as libertarian; after a few years of being involved with them, I came to see that it often was the biggest reason. All the economic analyses and the talks about rights theory was nice, but it was ultimately a show for people to justify lifestyles of partying and escaping objective moral truth. 

Thankfully, I think people honestly grow out of this stage more often than not. They start to realize they can have children and are building a world that their children will inherit. They see themselves come careening up against an abyss of relativism and emptiness and turn back before going over the edge. They have an Augustine moment, to cite the Saint you mention in your "additional info" in this question.

Do they hate the true, the good, and the beautiful? I don't think most do, not on a fundamental level. When confronted with their own humanity, a lot of them turn back. 

There are a select few who probably do actually hate objective truth, but that's more a function of the type of person attracted to an ideology and not necessarily a function of the ideology itself.