Exactly.
They are complaining about something that in the same breath they are doing. Just funny that's all.
Completely a false equivalency. The Post examined the claim in detail. They don't just laugh it off because the source isn't revealed. They look at available evidence, other outlets attempts at finding sources, and the credibility of the outlets citing the anonymous sources.
A major news outlet like the Washington Post, BBC, New York Times, CNN, the WSJ or Fox News puts its credibility on the line even when using trusted anonymous sources. When they are wrong it costs them credibility, damages the brand, reduces viewership/readership, loses revenue, and people can get fired. They are wrong sometimes and are forced to eat crow, but the vast majority of the time they turn out to be correct. It usually makes news when they are wrong - their competitors love to point it out.
When fringe news sites repeat conspiracy theories with no evidence, they suffer no consequence when they are wrong. Day in and day out, the internet shrugs and moves on. An outlet citing anonymous sources for captive aliens at Area 51 does not have the same credibility as the Wall Street Journal reporting insider trading, just because they both cited anonymous sources. Its a false equivalency.
Seriously, go read the article I linked. Ready any article on it that tries to unravel the "sources" of the "Obama wire tapped me" claims.
http://www.factcheck.org/2017/03/examining-trumps-wiretap-claim/http://money.cnn.com/2017/03/06/media/mark-levin-joel-pollak-breitbart-trump-obama/Also worth noting that your response is lock-step with PR machine of the administration:
Both Sanders and Conway said the president is the victim of a double standard, in which reporting on ties between individuals close to Trump and the Russian government is allowed but the allegation of illegal wiretapping by Obama is dismissed and criticized. Conway complained that anonymous sources are too often given credence in negative stories about the president and then ignored “when it may be something positive or exculpatory.”
http://www.politico.com/story/2017/03/donald-trump-wiretapping-obama-aides-response-235719