Lol, as long as his entire crew aren't nobles!

Even if he learns about her upbringing, it doesn't mean he's going to automatically attack her or something.  Yeah, he's out for vengeance against those he feels are contemptuous of the lower classes; those who acts as though their whims and fancies are more important than the lives of the common folk.  Those who've walked away from that life, or don't espouse those particular views, he's more or less alright with.

I mean, he'll probably spend his time teasing her in a manner somewhere between good-natured and not, but he isn't going to throw her off the ship or anything...