Just like you can't call someone a "bum", "tramp", "wino" or "hobo" anymore. Now, it's an ill-clothed, underhoused, non-employment-seeking, fermented beverage consumer...
Yeah, but prisoner transport vehicles are still called "Paddy Wagons."
I still can't figure out which ethnic/racial/religious/socio-economic descriptors are A-OK and which ones aren't.