karkat is from that bigass mess of a webcomic we call homestuck, and like most characters in homestuck, he has a text-based idiosyncrasy.

HE TYPES IN ALL CAPS, BOLDED, GREY COURIER.
HE'S ALSO PRETTY OBNOXIOUS AND DEROGATORY IN HIS INTERACTIONS WITH PEOPLE, TALKS TOO MUCH, HAS A TENDENCY TO FLY OFF THE HANDLE AT THE SLIGHTEST OFFENSE, AND IS GENERALLY WHAT YOU WOULD EXPECT FROM AN ADOLESCENT INTERNET TOUGH GUY.

if you would rather not parse the capslock courier, let me know, and i'll be sure to avoid using it while tagging you! additionally, if you would rather i not tag you at all, you can drop me a line here, and i'll be happy to comply, no hard feelings. comments are screened for your privacy.