I think a certain amount of noise if one lives close to people is to be expected. If the volume is very high and the radio is on regularly in the garden, I think that's rather unreasonable but perhaps you have now become hyper-sensitive to it. I find that the more annoyed I get about something, the more annoying it becomes.
I remember reading something that Jiddu Krishnamurti said - that it is the effort of trying to block out noise that causes us anxiety and discomfort, rather than the noise itself. He suggested actually listening to the sound rather than trying to fight it. This has worked for me regarding those very loud road drills (I used to dread walking past them) but it wasn't quite so effective in respect of children continually screeching and screaming in the back garden! (which luckily I don't have to put up with anymore as they are older now).
Lame Limericks (but they are funny anyway) (