how the guy who was walking around calling himself “Jesus from Nazareth” was actually totally from Bethlehem the whole time.

Iirc the gist of the issue why they wrote that was the same as the problem with Jesus being descendant of David through Joseph - he needed to fit into the messiah prophecy. And he couldn’t do that being a Galilean. Ancient Judeans were pretty chauvinistic overall in who is counted to even be a true Jew, remember the background of a tale of good Samaritan or how Herod was constantly bashed for being Edomite despite building spectacular center of worship.