I agree that he probably feels intimidated, although it'll be hard to know why. He could be a 'macho man', who just can't have a normal eye-to-eye conversation without bigging himself up in some way.
I went to a few courses on how to talk to 'superiors' and one of the great things I learnt was that you can do an 'adult to adult' style answer or question.
E.g. when he asks you something in a silly voice, just answer as if you were an adult talking to another adult, so just serious and simple. Just a suggestion in case you haven't tried that already.
He's probably a bit of a bully as well, so I think the best thing you can do is just keep an eye on the situation, and don't 'shrink' to his ignoring you. If you do it might get worse, as it seems that his aim is to belittle you. Make friends as well with the people you work with, as the social support will make work a good experience, but it might also deter him to see you doing well, and you may learn more about him too (you might find you're not the first).
Ask him a question in the 'adult' way, then, if he doesn't respond just walk away and ask someone else if you can, or stand there an demand an answer, whatever works best for you, but don't be discouraged. Be mature about it, as if he's the pain, which he is, and hopefully that'll give you some results.
I hope it's a short-term thing. It's pretty irresponsible for him to behave in that way. If it does get worse then there should be someone to talk to as well, as well as someone to rectify the situation without you having to leave.