God I hate when dev work gets all political.
Our team had a technical meeting with a difficult partner/customer, that wants to connect to our internal service, so we are writing an Integration Service for this.
Apparently the project is very important on both sides and highly political so in the meeting there was a member of the Board of directors of them. We just wanted to check one feature to verify they can connect, etc.
After some minor bugs showed up, that guy goes on ranting about how this is all a joke ("Verarschung" literally) and how we did not deliver all features yet as promised (Note : that was not promised) and basically indirectly personally attacked us, our company and our team.

It's incredible how such assholes can stay in such positions.