[kuroguro]

Haha, he's kind of right - there's two assumptions there. Saying grandparents are old and saying grandparents aren't technically inclined.

[throwaway2245]

The commenter said "your" parents and grandparents, who are by definition one and two generations older than "you", in age. I can't think of any other reason to invoke "your" parents and grandparents.

If the point is that it's unhelpful to make irrelevant assumptions about parents and grandparents, then this is in complete agreement with the parent's point and is not a critique of it.

This is not a clever gotcha.