I feel like my teacher is disrespectful towards me in the most subtle, Japanese way possible. What should I do? It's hard to pin down, but every time I ask a question in Japanese class, my teacher tends to do this long pause. Sometimes she'll look around the class as if to say "What does anyone else think?" and sometimes she'll say that explicitly, and get someone else to answer it. Other times she'll answer the question, but in a flat short tone that gives me the impression I was stupid for asking it. There was one time when she asked the class "Does anyone have a question?" and I slowly put my hand up, she said "Of course you do." That made me feel humiliated and awful, and I've been reluctant to participate or ask questions since, but of course, I need to understand the lessons.

It may seem petty, but anyone else who asks a question gets a different response; she always responds straight away, or considers the question openly; she doesn't defer the question, pause, or give any sort of flat response. It all makes me feel like I'm doing something wrong. I don't know if I'm asking too many questions, or stupid questions, or if I'm being impolite somehow, if I've missed some term of address (I always address her as 先生 or say すみません.) Despite all that I've said, when I talk to her in person, in her office, she's personable, empathetic, kind and helpful. I don't know why she's so deferential, apparently just to me, in class.

I don't know what I can do about this. Would it be inappropriate to raise this issue with her in person? I don't like the impression of me it would communicate to her ("I feel like you're not being nice to me in class" comes off the wrong way,) but at the same time, I really don't like participating in class because of the way she acts every time I try, and I don't know what to do to fix that.

EDIT: I'm British and from a British university, and my teacher is Japanese.
She says: "Of course you do." - Respond with a small nod and: "Of course I do:" followed by the question. Also, when you feel humiliated when she waits - you can turn this around. When she waits, look at her in a polite, indulgent manner, with an understanding smile (think: you - the OP - are the adult here!). Obviously (so you can think to yourself), she is unable to answer you more quickly, as you have a difficult question, she needs to reflect first on it. 

(Completely independent from that, check - just for yourself - whether you really ask too many questions or whether there is something wrong with them; perhaps they are unnecessary or easily answerable or superfluous? But no reason to feel bad, just inspect your question asking style and check whether it may have something you might be able to improve). In my opinion, there is no need to discuss things with her, as the likelihood is that she will downplay or outright deny it.