How about deliberately ignoring you? I had a boyfriend once, when I was 18 and he was 28, so he used my young age as an excuse to be condescending to me. Often I'd ask him a question, get no response, and think he didn't hear me. So I'd say his name and repeat my question, only for him to snap angrily, "Shut the (obscenity) up! I heard you the first time!" Then he may or may not answer my question. If he did, it was in an impatient, annoyed tone that suggested I was wrong for asking it.

I'm pretty sure that the reason I missed this as abusive behavior was because I grew up abused, and watching my mother get abused, so I thought it was normal male behavior. Which is why it's a good idea to talk about these signs. Yes, I'd say deliberately ignoring you is a good sign that somebody's going to be abusive.