I'm 14 and I have selective mutism and there was this teacher who treated me badly for it when I was 8

I can't put my finger on why this advert reminds me of that. It's a Morrisons advert which is kind of child themed so I think it's that but it's also the song in the background which gives me a 2014/2015 vibe.

At first it was like "oh this ad reminds me of her lol" but now everytime I hear it I cringe and my mood instantly switches and I get a lump in my throat and get angry feel like crying then I spend a while ruminating over it and getting wound up.

How do I stop associating it with that? The ad wasn't even around at that time