A lot of sitcoms aren't funny, but Big Bang Theory is like being held down by your older brother while his spit drips on your face.
Maybe it's supposed to be ironic? Like it's so bad it's good?
In high school my friends and I had bad-movie nights, where we'd do our own Mystery Science Theater. Is it like that? Do friends get together and smoke pot and have a Big Bang Theory marathon where they make fun of how terrible the jokes are?
Just trying to understand.
Maybe it helps that I can't really identify with the characters because everything is so American (and I'm not)?
(it's hard to explain, I never exactly realized which parts of US series--comedy or not--were "show" and which parts are just how US culture is, before I visited the USA. Maybe imagine all the tiny things that are slightly "different" when you watch a European series? Related, there's probably a lot of scenes in European series that make me cringe because they're a little bit "closer" than for a US viewer who maybe assumes it's just part of the show's quirkiness. Dating culture is one of many examples)
This is how/why my family and I watch it. It's fun(ish) if you go in with that mindset. Even so, it can be a complete cringe-fest at times.