If tall grocery store shelves were made with the assumption that people would be able to reach them, then people who are short, or who can’t lift their arms up, or who can’t stand up, all would have a disability in that situation. If an airplane seat was designed with little leg room, assuming people’s legs wouldn’t be too long, then someone who is very tall, or who has difficulty bending their legs would have a disability in that situation.
After reading this, I am curious about how the writer views these situations as a disability, while I slightly disagree. Instead of a disability, I see it as a disadvantage. Of course it's through genetics in which you may be short, or you may have long legs, but in my opinion, its a disadvantage. I mostly think of a disability as a mental or physical impairment that limits a person, yet being short isn't necessarily an impairment, but an unfortunate circumstance.