This is neither an act of becoming a bitter old person nor a grump. On the contrary, it is an act of self-respect. It is a conscious decision that life is too valuable to spend around people who make you feel worthless.
The Constant Critics
We’ve all met those people with an innate talent for delivering backhanded compliments. You tell them about something you accomplished, and their response will always be something like “Oh, yeah… but…” You choose something for yourself, and they raise an eyebrow, “Well, if you want it that way…”
At thirty or forty, you may feel like having enough energy to debate with them or persuade them. By seventy, this dance just gets too tiring. Life has taught you things; you know what is best for you, what you have won, and what you have lost in the process. To continue listening to a person who looks down upon you after such a long life of experience is pointless.