I work in a male-dominated sector where there is a lot of office jokes, usually at someone's expense. But I was outside of the office, entertaining one of my clients with a colleague. After two drinks (so not drunk) my colleague told my client, while I was standing next to him, that I am not very good at my job and gave reasons why this was the case. There was no punchline - just an awkward silence, and the conversation was quickly changed (by me). Could you see any scenario where this would be a joke? As far as I can see, even if it was a joke, it was a dangerous joke in that the client could have accepted it as truth. Joke, or is my colleague just an asshole?