I don't think Hawkes has socialisation issues - he seems to be perfectly willing to interact with people, and actually does it really well. His arson case, for example, or the girl with the teddy bear. Yes, he steps over the line on the arson case and is told off by Flack, but it seems to be from a willingness to help more than him being socially awkward. I always thought Hawkes came off as being quietly confident and at ease with himself, and I liked that about him. I actually think he handles people better than say, Danny, who can come off as rude. (Not that I don't like that, Danny's best moments come out of his grumpiness)