Don't blame the teachers, they don't know the latest technologies themselves, they are mostly graduates, who have almost no work exp, so they might not know latest technologies or how to use em, neither do universities fund them to learn them
P.S. Not a teacher, just put yourself in their shoes

When they don't know anything, why do they even apply as teachers?

But sometimes, teacher tends to force that their techstack is better than any other and forcely impose that upon student in form of assignment and project related to them.
For eg. my college force everyone to do their web development in java servlets.I wish syllabus can be updated every 8-10years.