Review of Katy Perry's "Ur so gay" song

I find that "Ur  so gay" by Katy Perry was a really discriminating song to all lesbian, gay, bisexual, and transsexual people, while listening to the song the object of focus was not clear i wasn't sure whether she was mocking them or just joking (even so it still wasn't right that she wrote the song in the first place because it's really just rude.)
I don't think or believe that Katy Perry meant it in anyway to be mean towards gay when the video was created and I'm not quite sure why she used barbie dolls to represent her and (So i believe) her boyfriend but, the most OFFENSIVE thing that she said in the song is "No you don't even like, no you don't even likeeee PENIS." (sorry it's inappropriate) So I'm not even sure why she added that  part, but in the video it shows a barbie doll with a crotch whereas in reality all barbies' have nothing but an underwear etched on to their "skin".
I don't understand it and i really do like Katy Perry's music but....you know what that's just not cool.

Thanks for reading and hopefully caring,
RAINDROP

hehehehee :)