Sounds utterly ridiculous doesn't it?
Of course what Jesus actually said in John 15.12 is "this is my commandment, that you love one another, as I have loved you". Yet think about so many issues Christians are known for these days. Think of the people we mock for not being able to believe in Creation. For those who tell us we can't pray in schools. Plus of course, all the groups of people we so often leave out of the grace picture.
So when you are tempted to hate, or entertain it's little brother 'ridicule', think about this "Thing Jesus DIDN'T Say".