My ex (currently co-habiting) does this to me, all the time. If we're discussing things and it gets a bit heated, he'll tell me I'm screaming at him, that the neighbours must think I'm hysterical, that he won't talk to me until I've calmed down and stopped going crazy.
Its an absolute brick wall - if I say I'm not screaming (because I will swear on my life my voice isn't above talking volume) he repeats that I am, if I try to continue but at an even quieter level, he just keeps repeating his 'calm down, calm down' and if I give up and stop talking, he sees it as a victory and goes about his day.
This article really resonated with me.