I would note that one common line of attack against trans people, and against gays and lesbians and bisexuals, is the idea that if they do something outside of the heterosexist norm it is automatically inappropriate and sexual. Holding hands with a same-sex partner is pornographic, for instance, even if the holding hands is just holding hands. Trans women particularly have often been accused of dressing and presenting as women as part of their sexual fetishes; a trans woman walking down the street, in this reading, is forcibly enlisting hapless passersby in support of their exhibitionist fetish.
Pamela could well have been arrested while she was minding her own business, simply because the police assumed that of course she being out in public was automatically her being inappropriately sexual in a public space. At this remove, I am not sure we will ever know.