I don't think another maintainer on the Linux kernel qualifies as a perfect stranger. The team isn't /that/ large.

Different because Mauro is talking on behalf of the Kernel and claiming obviously bad changes are good ones. Linus is reprimanding a subordinate that is supposed to be one of the most well-informed members of the Linux community as a kernel maintainer -- he's not criticizing a stranger for posting a tiny script in case it "might be useful".

Linus is DFL (not so benevolent sometimes) of Linux, and can lash out when one of his trusted lieutenants is acting like an idiot. What these guys did is call out a stranger on the street and said "YOU SUCK!"