My parents never frowned on cosplay until I started. I started budgeting extra money into simple outfits from thrift stores. It quickly grew into making my own things from scratch, learning to sew, do makeup, and style wigs. They called it a waste of time and money, and waited for me to grow out of it, even after I brought home a cosplay award, and a second one, and a third. I'm in my mid twenties now, and I think they have given up on stopping me, but they still ask when I'll stop fairly often.
lol, well, since you are an adult, you can choose to spend your money however you want :) As long as it makes you happy and you’re not neglecting work or other responsibilities, and not hurting any other person, just keep on cosplaying, You’ll gain a lifetime worth of friends and memories :)
Annon, I have the same problem with my folks and I just ignore it. You’re your own person and, while you can respect your parent’s opinions, you don’t have to take them into consideration, so keep doing your thing~