Given all the different sources for water that we as campers are presented with at all the different campgrounds, it's also possible the water contains substantial amounts of calcium, rust, sediment or whatever. All of which could clog the small openings in the aerator. This sounds like the most likely culprit gievn that the kitchen and outside taps work.
CLR......available at any good hardware store, is great for cleaning these. Also great for cleaning the shower heads in your RV AND at home.
Ken and Terry
2010 Georgetown 330TS being pushed by our
2017 GMC Terrain toad (4 wheels down)