I don’t know about OP. I went to a public school on the eastern seaboard and we certainly weren’t taught “Spain Spanish.” The pronunciations we were taught would’ve been very different if that were the case.

If any specific dialect was taught in my old schools, it would’ve been because a teacher spoke that dialect natively. All of our teachers were either non-native Spanish speakers, or from somewhere in Central or South America. Maybe OP had teachers from Europe?

If there were regional differences for vocabulary, we were told about them. For example, for the English word “bus,” we were taught that “autobus,” “guagua,” and “camion” all work but in different countries/regions. To be clear, we weren’t expected to remember all the variations, but we were informed that they exist.