p.s. This is also why I respect Linus.
In between those two extremes are a wide range of responses that can express anger at having your time wasted, through gratitude for something but inability to use it because of $REASON, through all sort of other stuff.
I guess brutally honest is open to interpretation too. I do mean, honest, professional, constructive feedback, but don't blow smoke up my ass when I need your help, because that is not what I'm there for.
I respect PG, and the simple fact his time is limited, and his terse replies are usually to the point and justified.