I don't buy the no one can hurt me part- seems childish (my personal experience with this defense mechanism). Once you'll get close to someone you're risking the possibility that they can hurt you. Only ppl with no real human connection can't be hurt - still risking the possibility of being hurt physically and emotionally by strangers though. So yes ppl can and do hurt you (and you sometimes hurt them) but if you're strong enough you can overcome it.
Ideally I think clients are not supposed to be able to hurt their T- but it does happen and depends on the T how he/she handles it.

Frankly, I don't see how saying this could be beneficial for you- cause you obviously got hurt and this might be implying that you let it happen (i.e. let ppl hurt you).