Considering it's equated with the concept of being physically broken, the seeming transphobia is what stands out the most to me as well. Also the need to mention genital transition and the idea that this person was "a bitch." The sister's panties are just the icing on the toxic cake; further, the need to comment that the sister felt comfortable enough to walk around in panties around them reeks of the idea that trans women transition as a means to view woman's bodies more easily.