Which part of his statement is a) incorrect b) shaming anyone at all for buying aircon?

Aircon uses a ton of electricity, electricity generation is, at present, hovering around 50% from fossil fuels (in the EU as a whole[1]) which means all other thing being equal you'll be still pumping more CO² into the atmosphere further exacerbating climate change.

So yes, installing aircon everywhere would only make things worse. Those are just verifiable facts.

But you'll note he's not shaming anyone, as per the original claim.

But thanks for the rant, it was highly amusing.

1. https://ec.europa.eu/eurostat/web/interactive-publications/e...