The sweeping changes have led to tensions. Some of the new arrivals have rented out basements, back bedrooms and attics. At one point, front yards were jammed with cars, and construction trucks were parked on narrow streets. The grassy medians often got treated as dumps, collecting beer bottles, dirty diapers and fast-food trash that longtime residents still spend their weekends picking up.
http://www.washingtonpost.com/wp-dyn/content/article/2011/02/14/AR2011021404044.html
Experience molds perception.