Something is off with Kentaro

I think Kentaro blew a fuse this weekend or something, he's talking like a 15 year old high on MDMA lately...

Here's a conversation we had recently:
xTian: hey
xTian: so someone goes
xTian: "arigato" to you
Kentaro: hey
xTian: what do you say back?
Kentaro: 'domo'
xTian: what's that mean
Kentaro: it means 'screw you'
xTian: serious?
xTian: that doesnt seem like what i want to say
xTian: who is this person, is this bruno? where's ken
xTian: i want to speak to ken
Kentaro: actually, 'domo' might not be it. let me get back to you on that
xTian: the f*ck?
Kentaro: hey
xTian: ?
Kentaro: 'domo' is 'thanks'
xTian: whats arigato mean?
Kentaro: "doitashimashite" = "you're welcome"
Kentaro: arigato also means thanks
xTian: awesome
Kentaro: i think arigato is more formal
xTian: you are japanese right?
Kentaro: i think so

Evil thinks he's caught up in in the undertow of our downward spiral...any thoughts?