It's rare to see a former employer and an ex-employee mix it up publicly; such spats tend not to be in the interest of either party. But that didn't seem to stop David Ehrmann, a former advertising programmer for Reddit whose avatar still appears on the staff page.

Ehrmann took questions about the company and his departure late Sunday. He gave candid answers on a variety of topics about life inside the company that runs one of the most popular sites on the internet.

The trouble started when Ehrmann responded to a question about why he was let go — and his answer was such that Reddit's CEO Yishan Wong couldn't hold back.

Ehrmann wrote that he was not sure why he was let go, but said it might have been something about his opposition to the company's policy of donating 10% of its ad revenue to charity. He also insinuated that Reddit's charitable giving may have been an attempt to allay concerns among users that the site was becoming too commercialized.

"I think there was a motivation beyond what we got in the sales pitch, but I'm not sure what it was," Ehrmann wrote. "I remember a time when Yishan said that it feels like any time we feel like we might be doing something sketchy, our knee-jerk reaction is to make it OK by donating to a charity. Others have called it 'reputation laundering.'"

Wong's account responded:

You were fired for the following reasons: 1. Incompetence and not getting much work done. 2. Inappropriate or irrelevant comments/questions when interviewing candidates 3. Making incorrect comments in public about reddit's systems that you had very little knowledge of, even after having these errors pointed out by your peers and manager. 4. Not taking feedback from your manager or other engineers about any of these when given to you, continuing to do #2 until we removed you from interviewing, and never improving at #1.

Wong went on to state that a non-disparagement agreement had been voided by the former employee's AMA — in essence, leaving the company free to take potshots at Ehrmann.

"Even if you don't sign the non-disparagement, the company will give you the benefit of the doubt and not disparage you or make any negative statements first. Unfortunately, you have just forfeited this arrangement," Wong wrote.

Ehrmann did not appear to respond to Wong's comments.

A Reddit spokesperson did not respond to a request for comment.