The reaction makes perfect sense, of course. Vexen, after all, does not technically exist even though he's standing right there, and like all of the Organization he has extremely strong magical abilities. Indeed, his are stronger than most, between his ability to harness two distinct and separate elements and the fact that he relies on his ice magic for the majority of his fighting.

Of course, that does not excuse the noise in his mind. He is not as forgiving as some.

And he's more than willing to wait a while longer for Dot to quiet the child down. Even had never aspired to fatherhood, though it would not have come as an entirely unwelcome state of affairs, and he had always tolerated children well. Vexen, on the other hand, is not only incapable of liking them, he comes as close as possible to disliking them as he can.

Well, at least with his current lack of heart.