Sometimes, I equate some interruptions with social awkwardness or eagerness to share. I've tried to be more of an active listener and allow people to finish their point before getting in my 2 cents. Because I am socially awkward, and I grew up in a narcissistic household with chaotic dynamics.
I had a boyfriend once cut me off mid sentence. He assumed he knew where I was going with some advice I was giving to a 3rd party, and tried to brush it off. I immediately announced I had politely let him finish his points and I was not finished with mine. He actually rolled his eyes and said, okay, "let's let her finish." The tone suggested he was bored and annoyed; that I might not have something useful to add. Everyone agreed it was so rude and off-putting. And they dare to wonder why they become exes?