Ted Cruz is back in Texas, but he's still hearing boos -- the senator just got an earful of jeers from fans in Houston while he was riding in the Astros' World Series parade.
Cruz was on a military jeep as part of the celebration for the best team in baseball ... and cameras caught fans laying into him as his ride made its way through the streets.
People booed loudly ... and, according to Astros reporter Ben DuBose, some even flipped the lawmaker the bird.