I'm not sure I saw the same condescension you did. I think the parent were simply pointing out that not everyone who wants to kill themselves is the same. Some people who want to kill themselves actually have solutions available to them that will make them not only not want to kill themselves, but also live fulfilling and enjoyable lives.

The grandparent was saying it should be easier for people to kill themselves, and I think the parent was trying to point out that this isn't a perfect solution since there are so many who think that suicide is their only option but there are really other options.