I Wasn't Finished

Today I wondered about whether there's a difference between interrupting someone and attempting to finish someone else's sentences. Whether someone interrupts me, or incorrectly attempts to finish a disturbing number of my sentences, the whole experience is draining because it requires extra patience with the person, and stamina for the energy it takes to maintain a coherent thought, stay focused, finish articulating a thought in its entirety and suffer through that annoyed feeling.
If someone wants to finish my sentence exactly the way I would've finished it, that can be gratifying and confirming, as if experiencing a miraculous-seeming coincidence when our intellects connect and we are one, momentarily.
If someone interrupts me once or twice (and I might get overanxious and interrupt the person I'm talking to), I expect that it's going to happen.
But the consistent interrupting and erroneous thought-finishing immediately makes me feel as if the person doesn't care about what I have to say, doesn't think my complete and finished thoughts are worth listening to, or arrogantly and wrongfully assumes the person already knows what I'm going to say and doesn't have the patience for me or interest in my thoughts to let me finish. Lately I've found myself resorting to such tactics as "let me finish," "just hold on a second," "what I'm trying to say is ..." "wait a minute" and "I wasn't finished." Sometimes it's not worth the energy or the time, and I just look at my watch.