First of all, what is so funny about calling a girl a slut? Nothing. It's just not funny. It's a put-down.
Your boyfriend was flexing in front of his friends, and later when you said honestly how you felt about it, he didn't explain, acknowledge your feelings, or apologize. In short, no you should not accept this.
Teen girl should communicate her feelings honestly to her boyfriend and decide if she wants to continue the relationship.
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