Hi angel - fishtank has raised an interesting point - that he is making two contradictory statements. If he is dominant - he is a rubbish social worker, and again I believe that people who want to dominate do so from their own anxieties, insecurities. How far are you along the assessment process. You could ask a friend/relative to be with you (unless you are a couple) but I somehow sense you are applying as a single carer, to give you some moral support. I was always happy for someone of the applicant's choosing to be present.
It's also a pity that you have a problem with dominant males, because of your own past, as being submissive will give him more licence to dominate. He sounds very mixed up, as he seems to be perceiving you as someone who you are not. YOU are an expert on yourself not him.
You don't come across at all as some "know all" and I think the problem is his, not yours. If you are nearing the end and he is going to recomment you, then maybe you just stick it out, but if you are near the beginning I think you might have to talk to his team manager. You never know, others may have problems with him too. Do you have the opportunity to meet with experienced foster carers (this should happen as part of the training course) cus if so, they can usually give you the lowdown on all the social workers.
If this bloke just does assessments, you may be rid of him once approved, but there is a chance that he is also a link worker, and so you could end up with him as your link worker and that wouldn't be a good thing for you. Anyway one step at a time.
I think as fishtank says, you could ask him for examples of what you have said to make him think that you think you are always right and also examples of when you seem to lack confidence. Social work these days has to be evidenced based, so this is quite a good thing to put to him. If he is going to make those kind of statements in his report, he is going to have to evidence them.
You don't need to be confrontational, you could be "puzzled" (a good word for when you mean pissed off!) and mention evidence based social work and it would be "interesting" for him to be able to give examples etc.
Let us know how you get on.