You've raised a good point, to be told that you're being overly sensitive whenever you take issue with a hurtful comment really is a kick in the teeth. Hell, I think we all wish it could be 'water off a duck's back', but every hurtful thing sinks in deep where it festers until we can put it into some kind of perspective. I think the sad truth of the matter is, no matter how hard we try to explain our needs and how crippling insensitive comments and actions can be to us, most folk really can't grasp this. Those that are genuinely oblivious to this, I tend to have a more forgiving attitude towards. When comes to those I suspect are being hurtful on purpose, those are the ones I cut out of my life all together.
Anyway, I hope you start feeling better soon,