Why does my boyfriend say yes ma’am to me?

when i tell him to do something small like go shower and take a rest he’ll play with me and say yes ma’am it’s so funny but i’m like jeez omg what does it mean.
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no i know it’s for manners LOL… i’m saying he’s not the type to usually say that well to me he said he was joking
Why does my boyfriend say yes ma’am to me?
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