A trans woman went topless after being told she couldn’t change the gender on her license from M to F, so she stood topless outside of the DMV and got arrested for indecent exposure, after which she claimed that if she were a man then she committed no crime.
The police didn’t care, and sent her to a male prison, for a crime that would only be a crime if she was female, in a male prison.
B-b-but what if I taped a picture of boobs on my chest and walked around in public wouldn't I get charged with indecent exposure too?
No. Indecent exposure specifically refers to exposing one's own body. In that scenario you would get charged under obscenity laws.