I don't think this is sexist in any case. Sexism implies that the author suggests through the post that one sex is inferior to the other. I don't understand what could have possibly provoked such an interpretation.
Of course, the party also wants to -modify- copyright law, but that's a different point. I did not intend to summarize party policy with my previous comment.
The whole pirate theme is intended as humour, and a lot of us love Monty Python. The point of defending the Pirate Bay is that it is in fact not the site itself but it's users that distribute files with copyright-protected content. The Pirate Bay is a neutral medium.
The Pirate Party is not dedicated to piracy. It's dedicated to privacy and personal integrity, fighting the patent system and maintaining an open, free internet.