I'm a firm believer in that girls need to know how to change and or check oil in a car and boys needs to know how to iron and sew along with cooking. Never know when it might come in handy for survival for themselves and their mate. That being said when my son took sewing in school, he brought home the needed list and I told him to go get the stuff from my sewing area and then I would check and see what he still needed. Well he did a fine job - Gingher scissors, etc. Needless to say we changed things out to a more least expensive stuff for school. At least he know what was Mom's good stuff. But i am proud to say that he could sew on a button etc if he couldn't talk Mom into it and cook and our daughter knows how to use a saw, hammer, and a screw driver better than her husband.
So go for it and teach your son to sew - it is fun to see how excited they become when it is accomplished.