How does such a person live with himself, I wonder?
Quite easily; it's known as the paradox of tolerance and much smarter people then myself have explained it pretty well; but basically means you can be intolerant of things like racism (ie. intolerance) and that a certain amount of intolerance to people being jerks to others is required to live in a tolerant society. Perfect example is Canada's hate speech limits on free speech, where people aren't allowed to say anything they want without consequences. Pure tolerance sounds good on paper, but falls apart in practice because people can be jerks and will take advantage of that.
Paradox of tolerance - Wikipedia
Libertarianism is a pretty broad category, and and can include anarchism (ie total personal freedom), forms of socialism with no personal property on one end of the spectrum, and free market libertarianism on the other end. Same starting premise, but completely different logical endpoints.
It can get taken to a lot of harmful extremes, so not a big fan as a political concept. For example, extreme market deregulation in the US banking sector has led to multiple serious crashes with massive economic impacts.
So, social liberal (with a small l); basically think that government intervention is needed all over the place because people can't keep their stick on the ice, but don't really care what consenting adults do in their bedrooms. Fiscally conservative (again, small c), because I think government shouldn't mortgage our grandkids future by constant overspending, but also recognize that bankers can't keep their stick on the ice either, so all kinds of financial regulations are needed to ensure stability and that the system is sustainable, while paying people a living wage, and not wrecking the planet via predatory resource exploitation (both natural resources and people). Very little of that is 'libertarian' in practice, and as a political theory it's so wide that I think calling yourself a 'libertarian' is a bit meaningless, and don't think the juice is worth the squeeze to run through the endless subdivisions.
Voting wise that doesn't align to anyone, and while there is a bunch of good stuff in the PPC platform, the party members and candidates continue to behave like rabid assclowns, and really can't get behind their COVID stance, so that's a hard no for me.