I can relate to this a bit and can suggest a couple of things: First, get him to talk less -- at least until he's more familiar with the people around. Second

I can relate to this a bit and can suggest a couple of things: First, get him to talk less -- at least until he's more familiar with the people around. Second, make him aware that people see him as peculiar. This is probably a 2nd order effect of what makes him so technically brilliant, but he can prepare his partners in conversation by saying that he is "very technically minded" like Spock". People will generally be much more comfortable interacting with him having this expectation set early on.