There are forms of technology other than software, and wheelchairs are one of them. YCombinator has invested in dozens of medical device startups... including devices in the mobility category: https://www.ycombinator.com/companies/trexo-robotics
I get it but the acting surprised feels condescending and annoying itself. Maybe I should have articulated that better. There are always ignorant people. Always. Take that opportunity to answer their questions and move on. Not this "I know right. gawd. youd think theyd know better..." come on man, that's just rude. Like of course, there are gonna be questions and confused people. Don't be condescending and act all surprised.