Name-calling

Hello,

Since starting my new job 4 weeks ago, my supervisor has called me a number of impolite names(junior, kid, dumbass). I called my regional manager at the end of my second week and told them about it, which they responded by saying it was inappropriate, and they'd take care of it, etc. Well it happened again last week and this week. Other than making a remark back at my supervisor, what other steps could I take?

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