I dont quite understand how to handle disrespect.

Hi! So I heard of this technique of asking the person "can u repeat?" But I quite dont get it.

Let for example a conversation that happend to me today:

Grandpa: Oh, I see a Gray hair in your head!

Me: haha yes, those are my wise hair :3

Mother: So you finally got smarter after years.

I find it quite disrespectfull as she was pretty controlling mother and it was really hard for me to become independent emotionaly.

But If I say: "hmm can u repeat?"

I belive she would go with a looong story how I was stupid according to her when I was growing up.

The only way I see is to be quiet and just accept that her narrative is just very different from mine and I choose to stay with mine.

Or I could say "it was disrespectfull" But not sure if it isnt better to just ignore.