I don't even really care who wins the Democratic primary. I, personally, can't vote for Hillary Clinton because I am very opposed to her more militaristic foreign policy which, despite her protests, is very well represented by her vote for the Iraq war. Bernie has lots of flaws and certainly wouldn't be my first choice for a not-Hillary candidate but that's who's left. Krugman's continued insistence that Bernie Sanders supporters are thoughtless dreamers who don't care about reality just really pisses me off.
At this point it seems reflexive on his part: "People disagree with me so I must be on to something, let me repeat it!"
I really don't like being a Sanders shill (because, again, don't actually care much who wins) but lots of the dickish behavior of Clinton supporters pisses me off as much as the Bernie-bros, and it particularly pisses me off when it comes from someone like Krugman on the pages of the NYT. The Bernie-bros are bigger assholes but they don't have the institutional megaphone that Clinton backers have (because Clinton has all the institutional support, much of which has treated Sanders as a joke from the start).
So, to supporters of both Democratic candidates:
Your preferred candidate does not have all the answers and supporters of your preferred candidate's opponent are not deluded robotic simpletons without capacity for thought. Stop fucking treating them as such.
(Note to supporters of any GOP nominee: Sorry, but your preferred candidate really is either stupid, a yuge asshole or, likely, both.)