Just had one of the local scrotes go past our house on a 125. You don’t need any sort of acoustic camera to realise that he should get nicked for it being too loud!
Unfortunately that is the price of progress! If you bought one of those flats and had young children possibly woken up by it you might have a different opinion?
But the person chose to live there and presumably did their research of the locality, No? Should they not have considered the whole package and possibly purchased elsewhere if deemed unsuitable rather than blaming someone else for their lack of initiative.
The legal limit is 74db (similar volume to a vacuum cleaner). Anything above this would be getting a ticket. Considering that they would most likely be on urban locations, you'd be either needing a really loud exhaust to set this off at 30mph, or be revving maybe a bit too hard. Probably can just pull in the clutch and coast by if an issue.