It's actually quite easy to setup parental controls on a mac and those controls are quite robust. This is sounding more and more like those controls were setup and you just don't realize it. You say it is an 'office' computer...is it a byod (personal) or a corporate-shared (business issued but allowing for personal usage) mac? Or is this nothing more than a kid trying to get around a parent's attempt at internet control?
Sharonto said it is his own mac, not an office system
"It is my own Mac, not office."