To be fair to my colleague, when I explained it to them, they got it.
It literally hadn't occurred to them. Why would it? Their job was to sell out a conference on renewable energy or whatever it was.
But in my experience, almost everyone gets it once you give them context.
Almost everyone knows someone with #accessibility needs, even if they currently have none themselves.
#Ableism is a silent assassin in our culture. It pervades our discourse.
We must hear the voices of the #disabled.