Maths is objective and practical. It has proofs and practical applications which are useful both in our day-to-day lives, as well as in engineering, medicine and all the other things that make modern living what it is.
Art is subjective. It has no practical purpose beyond being decorative. If it's ugly, it's no decorative and I don't want it hanging on my wall. If it requires education in a certain way of thinking (that aligns with the way of thinking of self-designated 'experts' in art) and can't be immediately appreciated by anyone looking at it, then it's pointless.
You can also teach a baby to speak Klingon. That doesn't make it any less pointless.
Wow. This is a stunning dismissal of the last 600 years of artistic endeavour. I'm going to bow out now, so far apart are our opinions on this matter.
Art is SO much more valuable than you give it credit for.