It's that dissonance between the "crap" prime minister and the ending of the crap times. Thatcher was after the 70s, lad.

Thatcher became prime minister in 1979 which isn't after the 70s. Old fogie.

The 70s were crap because of high inflation and fuel costs. Winter of discontent etc.

The 80s were crap because Thatcher basically dismantled the working class.

Is it dissonance about Germans complaining about interwar issues and complaining about the leader they ended up with?

The 80's weren't crap. The 80's saw a massive increase in wealth for the working class. There was even a whole comedy character about it - https://knowyourmeme.com/memes/loadsamoney

It was also the end of the mining industry, and many other manufacturing industries. There's documents discussing the managed decline of Liverpool.

Some people who were working class may have done well, but the working class as it was basically ceased to be.

I think it depends which end of the country your piece of the working class was in.

Yes. The Thatcher era marked the end of a lot of stagnation, and while at the time people might have linked her and the era, plenty of subsequent people don't like Thatcher despite the marked increase in quality of life post her era.