My nickname was as "JoãoFodão" and suddenly it changed to "user743574". Why? Is it normal?
I changed the username. It is vulgar in Portuguese. I understand that it is not intended as offensive, but vulgar language is frowned upon. Since this is a network-wide principle, I changed it network-wide. Since it is clearly not intended to offend anyone, I did not find it necessary to send a message, and I thought the situation to be self-explanatory to understand.
I could elaborate to nonspeakers, but I really don't see a point of analyzing a word akin to the F word and its derivatives.