(Via stonerjesus240 on Twitter)
The easy answer to that question of course is that liberals hate, that's what they do. They hate anyone who disagrees with them. They try to debate, but soon are sputtering, changing the subject, and always come down to calling their political opponents some form of stupid. To them, name calling equals logical debate. They hate when that doesn't turn out to be true, and they look like a cry-baby, calling someone a moron instead of refuting their point.
And it keeps on going in that vein. Worth a read.