Although I also don't believe in "writer's block" as a specific, crippling psychological condition, I also don't think it's pure laziness, either. I think it's simply hitting a period when, for whatever reason, you're unable to relate to your own writing. The only "cure" is to keep writing and review it later; in my experience, I often find that what I've written is good or salvageable, and at the least it shows me what NOT to do with a scene, which is valuable knowledge. Most importantly, it doesn't let the idea of writer's block become an issue.
However, as others have said, it doesn't sound like you have writer's block; it sounds like you now live in a writing-unfriendly environment. As someone with multiple neighbors who REALLY love playing REALLY loud salsa, believe me, I know it sucks. Things to try:
1) Play your own music so loud you can't hear theirs. This only works if (a) your entire building is loud, as it is in my case, and (b) if you can write with loud music playing, which I can't always do. But it's worth a shot and relieves a lot of frustration.
2) Find another quiet place where you can spend time and work. Only works if you have a laptop or access to another computer at that location or if you write longhand. If community libraries are too loud, you might see if there's a nearby college library you can possibly access; these tend to be much quieter (particularly if there are specific sections for sciences/law/etc.) and the probability of a nearby coffee shop for snack breaks approaches 100%.
3) As others suggested, noise-canceling headphones are a blessing. This works nearly all the time. I put mine on and listen to my own music softly while the people nearby blare their salsa, but I can't hear. (Now, when the vibration comes through the floor, there's really nothing to do but bear it.)
4) If you have a laptop or work longhand, consider going to your favorite restaurant in off hours (between, say, 2:30 and 6:30). If you eat there regularly, order a couple of coffees and aren't taking up space at a time when they need it, you might be pleasantly surprised to find out welcoming some places can be. I have found a couple of restaurants in New York that are perfectly happy to let me spend the afternoon on my laptop in the corner. (A good writing reward is to invite a friend to meet you for dinner at 7 but get there around 2:30 -- ensuring you'll put in more than 4 hours of work before the evening's socializing.) The atmosphere at a restaurant in the off-hours is usually fairly quiet, the server will be polite as long as you aren't taking up their time and your distractions will probably be limited to nearby refillings of ketchup bottles.
Hope some of this helps!