Is OTHER wrong in the post ? POST : So a bit of backstory, at my workplace, anything goes. Everyone is really playful with banter, you wanna throw something across the store? go for it. Wanna shout to the bakery person "Hey, Masturbater" (nickname for the master baker) sure thing! wanna literally tackle each other and call each other pricks/cunts etc? Knock yourself out! 

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So anyway, my supervisor, who's the most playful and full of fun banter, known for jumpscaring people and trying to hand you stuff, dropping at infront of you and walking away, he tells me his SO is coming in the store, and she's more brutally full of dark humor and harsh banter than anyone in the store, talking up some pretty big game, so I think it might be fun.

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She comes in and hears that we playfully throw soft things at each other and fake hit each other all the time and she gets protective in a way like "only I can bully my man" kinda attitude and I play along and say stuff like "it's only self defense" and "I just give as good as I get"

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So it's coming a bit forward in to the day and we're chatting, my supervisor throws something at me so I say "is that so" and walk behind him to fake kick him in the ass, his SO jumps inbetween us with her fist raised as if to say "do it and I'll punch you" and we both know it's only banter. I then say "Oh hey, looks like you've got a loyal guard dog on your side" and everyone bursts out laughing except for her, she goes red in the face and starts getting aggressive because I used the word "dog" even though I meant it in a positive and banterish way. 

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AITA for assuming she wouldn't freak out at a non-negative context "loyal guard dog" because she was willing to fight for her partner, even though everyone said she's more brutal and doesn't get bothered by anything? 