Are Liberals Really that much nicer?

I admit that I lean left politically. I am facebook friends with The President.
Many obviously right leaning people tend to post rude and even vicious coments on his page. They probably take up at least half of the comments.
I noticed a friend “Liked” GW Bush’s page.
Out of curiosity, I looked to see what coments were posted on his page.
Every single comment was kind and complementary. Not one derragatory comment to be found.
Are liberals just to nice to trash his page like conservatives do to President Obama’s page or do they censor it?