Mayor Bill de Blasio pushed back Friday on the idea that a recent rash of departures from his administration was anything more than ordinary turnover — and he had some choice words for one former employee. NY1's Bobby Cuza has that story.

Of the recent string of resignations at City Hall, one seems to have gotten under de Blasio's skin: social media director Scott Kleinberg, who quit after just eight weeks on the job and took to Facebook to vent his frustrations with what he called "political hacks plus a boss who just couldn't get it."

"I never met the guy, wouldn't know him from a hole in the wall, and I have no idea what motivates anyone to — that early on in a job — leave the job and then comment publicly," the mayor said. "Doesn't seem like much of a professional."

Friday, de Blasio commented publicly for the first time on the recent exodus of senior staff.

In the span of less than 24 hours this week came news of not only Kleinberg's resignation, but also the departures of the mayor's counsel, Maya Wiley; Emily Lloyd, commissioner of the Department of Environmental Protection; and Nilda Mesa, the director of the Mayor's Office of Sustainability.

All of this was on top of the recent exit of Press Secretary Karen Hinton. But responding to questions from reporters, de Blasio rejected any link to ongoing investigations into his fundraising practices or to low morale, instead noting turnover at City Hall is, in a word, normal.

"This is normal," de Blasio said. "It's just the normal course of government.

"We have a lot of talent on our team. We have a very deep bench. Everything's continuing to work."

What's also quite normal for the mayor is criticism from police union head Pat Lynch, who suggested that Wiley could not act impartially in her new appointment as chair of the Civilian Complaint Review Board.

That criticism drew this rebuke:

"I would urge him to go read the city charter. The chair is appointed by the mayor. That's the law," de Blasio said. "I find that to be just an unconstructive comment."

Everyone but Kleinberg appeared to leave City Hall on good terms; Lloyd was said to be retiring due to health reasons.