Are the examples so outdated? I see multiples comments/reviews (here and on the Internet) about the book not being made for modern people/society, but what you pasted looks fine to me.
Sure, there may be cultures where making comments of people out of the blue might not be seen as normal, but almost everywhere I've gone in this world allows for comments like these.
I haven't read it, but I find it hard to believe that good social advice would go out of date. Our brains haven't changed on a fundamental level since then.
If anything, modern social interaction has diverged from what is good for us and what we really want.