Why does my older brother always lift me up when we argue and after call me good girl?

He lifts me up and holds me if im angry and then let go after and call me "good girl" wth is that I'm not 5? He will say "be good girl now" or "my sister is a good girl".

I told him im not a child but he doesn't stop

Why does my older brother always lift me up when we argue and after call me good girl?
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