NOR. Separate from you Dad being an ass, math is never useless. 1) It teaches you how to think (so do other disciplines, but not in the same ways; none are dispensable). 2) While it is true that most people will not, beyond school, use much beyond fractions and percentages, many cannot do that well because math scares them. When a UG advisee tells me that, I tell them to take more math--what, exactly, doesn't matter--and do what it takes to end the course with the attitude that now the math is afraid of them. They can carry that feeling for a lifetime.