As for noticing the little things, I don't know. On the one hand the person worked hard on it and wants to be acknowledged (so hopefully it was worth doing, rather than something the other party doesn't care about), but on the other hand, I'd be annoyed if someone were to point out every single thing I did, or try to compliment me on it. Maybe that position has wired out such behavior from me.
I guess it boils down to the fact that you want to be showered with compliments and I love yous, whether you admit to it or not, and it's then about who would be able to provide such an environment, because I doubt that would be an INTP. Maybe some INTPs can live in an environment where their natural inclinations aren't appreciated, but if I were personally complained to like this, then I would think the relationship should end. Becoming more "supportive" than I already am seems impossible, and I'd probably talk myself out of it at some point, so I wouldn't bother. That is, I think this is one thing about myself (talking about me personally) that I wouldn't want to change, even though it's such a common complaint. I'd start looking for someone that cares about other things. And with this all, I'm not saying that words don't matter, or that compliments don't matter, or that I don't give compliments/support at all, I'm saying that if what's needed exceeds my ability to give, and it's that big a deal, then I'd bow out.