I think the difference is defensiveness. Like Si is weak in me, but I'm ok with that. Te is weak in me, and I feel defensive if someone points it out. The opposite of my sister. She recognizes she is weak as far as Te goes, but she's defensive if I bring up her Si issues. If I say, "Oh come on, how many times are you going to clean that?" she'll get upset. Now if my husband says, "Please tell me you didn't drive far enough to use two gallons of gas to save 50 cents on something," I feel a little dumb. If he points out an Si thing, I just do what he says and I don't feel dumb about it.