As other Seattleites have mentioned, riding the bus here generally carries little/no stigma (at least not among the younger people I know), and is seen as a sensible alternative to hellish in-city traffic (especially for downtown commuters). I do own a car ('95 Volvo 850 wagon--with a stick!), but it's reserved for once-a-week Costco/Home Depot/Petsmart runs to nearby suburbs. The rest of the time, I take the bus, and I can count the number of times I've had trouble with a fellow passenger on one hand, with fingers to spare.
That said, I do have friends who think it's bizarre that I take the bus when I could drive, and never use public transit themselves--and they're all Boomers. I swear, they are the most bus-averse mofos ever, even when they admit that owning a car and driving everywhere is costing them a fortune. I've got a 62-year-old friend who has been unemployed for four years now, but he's got to keep his Audi, and walking anywhere is out of the question, much less taking the bus.
Among the WWII-generation folks I know, there's a split between those who take the bus (even if they can still drive) and those who won't go anywhere if they can't drive. I've got an 84-year-old friend who won't go see art exhibits downtown with me because driving is too difficult and parking is too expensive--yet there's a direct bus route that stops two blocks from her house that would have her there in about the same amount of time it takes to drive and park. I honestly don't get it.