Because, Inoue, he is one feral beast with one large bone to pick. A powerful creature used to being in control, now with a heart that won't obey him. And from his point of view, that is all your fault.
Also, I don't think my last response went through, but about the different font that I used in Ch15... I was told that Ulquiorra's dialogue was less refined when he was still a Hollow than it was when he was an Arrancar. But, it's easier to notice that in Japanese (formal and informal forms of speech) than in English, so I kinda had to fall back on style over substance. The font is rougher to allude to Ulquiorra's less formal manner of speaking.
nope didn't go through, but at least it's hear now so
But right i see now, but i see, you used to show formal and less formal speaking. You're right about Japanese being easier to spot the differences, it's the suffixes and respectful words they have. The only English that's clear to tell the difference is British posh southerners to more relaxed Northerners (i should know since I'm a southerner aha ^^")