From what I gather he is a libertarian who lives in cabin in the middle of nowhere Kentucky. He is massively against any form of government interference in the lives of citizens, which makes him a massive chud, but he is also oftentimes the only person in Congress who votes against the "give billions to Israel/Ukraine/Taiwan/other countries for dubious and imperialist reasons". I haven't read all that much by him, but from what I remember in his voting record, he seems pretty committed to his beliefs, and genuinely believes in isolationism. I don't for a second think he has a good reason for it, since he got elected as a republican in Kentucky, and people on this site have speculated previously that his opposition to Israel might be less about the isolationism and more about a general distrust of "cosmopolitans" or whatever libertarians use to refer to jews. He also explicitly called out AIPAC on his twitter when they were going after him for voting against the Iron Dome missile defence system that America was apparently just gonna give to the Israelis.

But isn't that almost entirely because she is too dumb to realize that partisanly opposing everything the Dems do doesn't apply to foreign policy?

It’s not proof that the GOP are anti-imperialist but it certainly is proof that the squad and DNC progressives are imperialists