[Wh- huh...! Hermes never really got asked this question before... He hesitates, looking a little embarrassed at not knowing immediately how to explain it.]

"...Because he deserves it."

Shush, you deserve it, too, buttface! Anyways!

It's sort of his personality and traits for him to be rude... See, he's really into being big and murdery and intimidating AndHeSpendsMost OfHisTimeInTartarus! And don't worry, nobody who he kills is real, Irene. We're both from a computer game!