Something I noticed in my last boyfriend - a narcissist:

Almost always, when I spoke for more than one sentence, he would answer with "huh?" and make me repeat everything. As if he had issues hearing me, problems with his ears or - that is how it made me feel after several months of this - as if I was too stupid to explain myself properly. He managed to make me feel like my words don't matter, like I'm not worth paying attention to. Related to this: turning everything into "silly banter", for minutes on end, until I got frustrated.

If you notice this behavior in a man, RUN.