My best friend from high school is a cop. He'll be the first to admit that being a cop has ruined his perspective on people, and on life. He specialized, for example, in investigating sex crimes against children. It's harrowing work.
Transgendered and transsexual people are at more risk for hate-crime violence than any other group, but lack the legal protections afforded to other minorities.
The actions of the man in your video are reprehensible. But choosing to call a police officer a "pig" is in essence equivalent to choosing to call a homosexual person a "fag"; the only difference is the criteria you use to justify the comment.
And it's not really fair to my friend, who has sacrificed so much of his peace of mind, and exposed himself to such awful events and people, in the service of protecting the public. I know you wouldn't call him a "pig", if you met him. But by using the term, you make its use more acceptable, and implicitly make the use of terms like it acceptable. I wish you wouldn't.