wow what a revelation
It seems that every time a republican does something on the internet, it back fires.
My two cents would be this: the internet is accessible to people all over the developed world. The rest of the developed world tends to be left-leaning compared to the American public. Since US politics are constantly in the spotlight on major sites like Facebook, Youtube etc., this results in a lot of liberally inclined people giving their opinions.
Also, the Republican Party has a pretty dismal track record on science. Outside of perhaps Tony Abbott, climate change isn't controversial in the rest of the world, thus why Republicans are constantly dogpiled for being supposedly anti-science. Keep in mind that bad science is extremely easy to make fun of, due to the fact that there's a clearly defined 'correct' and 'incorrect' when it comes to science, negating the usual subjectivity and grey areas around political issues.
EDIT: Oh, and foreign policy plays a pretty big role too. My father is constantly telling everyone how much he hates our Prime Minister (John Key) for "striking a deal with the devil" (Barack Obama), due to Obama's perceived hawkishness. This is not helped by the fact that the Republicans are seen as even more hawkish.
Stuff like this pisses off a lot of foreigners, and gives the internet community a lot of material to mock.
