Hi oomis!
Yes, when we become the mother, or MIL, of the younger married folk then we say, as you did, “When they listen to what i say, they see that I was right all along.” When it’s our own mother or MIL offering the advice, we naturally take offense.
As an MIL myself, I have learned to keep my mouth closed, except in cases where I observe behaviour that is harmful to the little ones. And even then, I usually keep quiet, as my comments are not appreciated. To put it mildly. What I find interesting is that the young people have no problem being opinionated and judgmental of the wicked MIL, and expressing unsolicited commentary and advice. It seems as we get ready for Mashiach everything really is turning upside down. The experience and love that MIL feels for her offspring give her no right at all to speak. The young DIL, on the other hand, needs have no such reservations.