Supersonic aircraft are definitely too loud. The Concorde was an absolute nightmare everywhere it went.

These days many(most?) major airports in the world have noise abatement procedures, the fact the general public was able to push back on this is a good thing at least when it comes to noise pollution. Obviously overall we still lost because there are some crazy stupid airports our there that are complete shit to the population, but it could be a lot worse.

The only reason China developed this tech is for military use because it was deemed extremely relevant to their survival i.e not just some novelty tech like US stealth planes, and the difference here is that usually the US would be the first one to waste money on this as long as you can claim it as part of the military budget it gets a green light.