Libertarians have come from both left and right leaning backgrounds, so they still have some sympathies to their prior positions. There are also "hard-line" libertarians who view any increase in government as intolerable.

The libertarians which have sympathies with conservatives tend to be okay with Trump. The rest are vocal anti-Trump, usually whipped up by the hard-liners who can't accept some of Trump's policies.

If you're going by r/Libertarian, that place was taken over by disaffected Dems (Yang gang, Tulsi, etc). Real libertarians abandoned it.