I live in a big city. But I've seen them at friend's houses in lots of places in the US. You can order one on Amazon for like $40 and install it in about 30 minutes.
This doesn't change the fact that bidets in the US are only in a vanishingly small percentage of homes. As an example, while not at all scientific, open up Zillow or Redfin and look at any random property and see if there's a bidet.
Yeah dude sorry but I agree with the other guy. You are living in a bubble if you think bidet adoption is high in the US.