I don't usually think of it as "Fuck this guy", but rather, "I can help this company." There's a lot implicit in that statement - that I want to help this company, that this company can be helped, etc. But fundamentally, it's that I am offering more to my employer than they are offering to me. If they choose not to take me, that is their loss.

Actually, that seems to be a good mentality to build confidence in general. I've heard (I haven't managed it yet) that the secret to getting girls is to think of offering them the chance to be with you - you aren't trying to "get" the girl, but rather offering your companionship and emotional investment to a suitable girl who's willing to take it. The secret to networking is to offer favors to people in need of them. The secret to negotiation is to offer something of value to the other side and ask for something that they value less in return.