Yes, but I have different reaction because the only person I regularly communicate with is my boyfriend & I don't experience this as a problem. We do this (sentence finishing or point summarizing) for each other-I find it affirming & comforting (how well we know each other) rather than annoying. It's romantic to me that he & I are used to (familiar with) each other's minds. It's not done to "shut each other down" but merely to express "yeah, I know where you're going with this & I agree so you don't need to continue as if I didn't 'get it'."
However, this is just my personal situation, and I realize that with other people it could be wholly different & unpleasant.
When it comes to strangers who don't have a clue about me, then I get upset feeling that no matter what I say, they won't understand (or will mistake what I mean). I have all sorts of anticipatory disclaimers that I throw at folks since I've been through certain types of idiotic conversations too many times already & am in hurry to get past the obligatory misconceptions.
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*"I don't know what it is, but I know what it isn't."*