I really disagree with your reasoning. I think that someone might simply consider any disability a reason not to live, and you are nobody to say that they missed the nuance of different disabilities, or that it’s ridiculous to think you’d rather die than being hard of hearing (which is what I think you implied). I disagree with the blanket statement, but I think your arguments are invalid both from the theoretical standpoint than from the practical one (when x becomes a list of 100 items you might as well use a blanket statement).
I am aware, and I am also aware that people are free to think what they want for themselves and I am nobody to judge them. You might think it’s ridiculous, but theirs is the only life affected by this, so they are well within their rights to have all the opinions they have on their life.
Not being aware of any disability is true, but their statement is relative to what they are aware of, not a scientific statement (since it’s a personal opinion), and as I said, you can also approximate to the blanket statement rather than mentioning 100 conditions.
I agree it might be insensitive to bring it up, but neither me nor the person you answered to brought it up, we merely answered to a comment that mentioned this expression.