This is just Linus being Linus - he's like this quite a bit. He's... very opinionated.
I don't have much tolerance for Linus like behavior in places that I work day-to-day though, without a lot of protective social niceties.
David wrote about it here, https://signalvnoise.com/posts/1214-profanity-works
This is the Linux kernel, it runs the world.
http://lkml.iu.edu/hypermail/linux/kernel/1510.3/02919.html
I would imagine that if you're is being flamed by linus on lkml, it is most likely because you messed up big-time. Don't expect to be reprimanded with sugar coating. More so if you are an adult/mature/experienced (in terms of contributions) person who should've known better.
...anybody who thinks that the above is
(a) legible
(b) efficient (even with the magical compiler support)
(c) particularly safe
is just incompetent and out to lunch.