I have a couple questions and please dont take these the wrong way.

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1) How do you know Y did all that in the bathroom? Did Y mention it? Is it based off Z's story? Were you in there? If you were in there, why didnt you say something?

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2) About Y telling Z that he can she Z's nipples... I have actually told a female coworker the same thing (though I was more discreet, I had another manager there, I never said nipples, and I was telling here that she needs to wear a bra or something (She is someone who doesnt like to wear bras) since a lot of customers (excuse me...clients) were telling me that they had issues with it. My question here is did Y just out of the blue and in front of everyone say that to Z?

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3) "Management knows that Z is a trans woman, but I feel like they would treat the situation very differently if Z was born a female or if Y was doing the same thing to the other females that work here. " MAYBE. You honestly cant say that for sure.

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My advice here is to tread VERY carefully. As much as you may want to get involved, it really isnt your place. This is especially true if Z doesnt want to do anything about it (file a harassment complaint, talk to SM/DM/HR, etc.) All of this is compounded by the fact that it involves a trans person. I know that may seem mean or whatever to say, but it does make things more complicated. If you feel the store management isnt addressing it, then yes go higher.