If you grew up on the east coast, where you have about 1 week of pleasant weather in between hellish hotness in the summer and ball-shriveling cold in the winter, you'd appreciate SF's boringly middling weather.
I did grow up on the east coast, and have, so far, lived my whole life here.
I would never describe the summers as "hellish" nor the winters as "ball-shriveling". I thoroughly enjoy the tremendous variety through all the seasons. I would say there isn't "1 week of pleasant weather", but rather, a year of tremendously varying, enjoyable weather.
But, of course, that's sort of the point - to each their own.
I think he meant NY or New England when he said East Coast. North Carolina doesn't fit that pattern of having consistent 0°F to 105°F range every year.
I do miss the snow, but that's what Tahoe is for.