Now I'm kind of intrigued. You think this Snape is calm? Because that wasn't my intent. He doesn't tear Harry a new one as often as Harry thinks he's going to, but then in canon he's not quite the beast that Harry thinks of him as being. Still, he belittles Harry when he can, throws him out regularly, excoriates James, treats Ron and Neville like shit.
"You are utterly without imagination, aren't you? Shut your fucking mouth before I shut it for you." That seems to me to be a fair example of how he talks to/treats Harry in this fic. I guess I see him as somewhat calmer, but 20 years have passed where he's not had to be a spy and hasn't had Harry as a daily abrasive.