Dani Mathers

Don't just blame Dani Mathers for the gym sauna pic she posted of a stranger -- without the woman's knowledge -- blame the woman too ... according to actor Brandon T. Jackson. The "Tropic Thunder" star had a much different perspective on the case everyone's talking about -- former Playmate Mathers…

Former Playmate of the Year Dani Mathers did a despicable thing -- posting a pic of a naked woman in the gym shower without her permission, and then got shamed herself ... into making a totally empty apology. Mathers thought it'd be funny to mock the unwitting woman's body -- she captioned the…