People make comments like that because they're too stupid to think.
Reminds me of my best pal job hunting after he left uni. He's partially sighted, and always told the truth on app forms etc. he applied for a job as a receptionist/switchboard operator for some tin-pot company and got a phone interview with some old bag who clearly hadn't read his form properly. When the subject of "do you have any disabilities" came up and he told her she said "so how do you think you're going to work the switchboard if you're blind?".
This happened loads. The discrimination and ignorance he came up against staggered me. And the way he shook himself down and carried on despite the extra challenges was and still is an inspiration to me. I'm pleased to report that he's doing very nicely nowadays, with an amazing job travelling the world which uses all of his considerable skills.
I hope the old bag is still looking for someone with 20/20 vision to work her shitty switchboard.