After anyone repeats something disgusting that a Christian has said or done, a chorus of Christians rise to the call:
They’re not REAL Christians, or they wouldn’t SAY that!
They’re PRETENDING to be Christians!
That doesn’t represent Christianity! They’re just young/hateful/angry.
You judgmental atheists are just saying they’re Christians. No way!
The fallacy here, as many know, is called “No True Scotsman.” What does it take to show that a person is a Christian? What does it matter to other Christians, except that it shows Christianity does not, in fact, make one a good person?