I'll never forget that little HCL interview blurb while Bruce is getting his head shaved, where Callum says he's afraid he'll say something stupid. Combine this with something that commonly occurs with very shy (or self-conscious) people, namely that their reticence is mistaken for arrogance, aloofness or brattiness, and I think you maybe have where he's coming from in some of these earlier interviews.

I think our boy (like most men, hee) is just a very late bloomer.