I commented on a question from this user a day or two ago, asking whether the screenshot of customer data is real data. That question was deleted (I think for moderation reasons) and I noticed he'd included the same screenshot in another question.
Given that the first row matches his own name, I'm inclined to think the data is real (and the individuals within are unlikely to have granted their permission to have their details published). I've asked the OP for clarification - with the purpose of asking it to be removed entirely if it is - but have had no answer.
I'm not raising the question in order to suggest that Stack Overflow is a publisher and thus legally liable for data protection issues (I am not a lawyer, etc). My purpose is to ask the community what our collective ethos ought to be, in the general case. For example, we could specifically put something in the Help section that requires real customer data to be anonymised prior to posting it in a Q&A site. Questions that obviously violate privacy could be closed, too, to encourage a culture of care around posters' customers' data.
I'd see this in the same light as spotting SQL injection flaws in people's posted code. I'd take the view that where we see it happening (and of course it requires an admission) then the OP should be steered towards a better path. Happily though, I've not seen it often.