Phobia - an extreme or irrational fear of or aversion to something.
If someone does not like Muslims because they say that Muslims eat too much pork, that would be a phobia. Because Islam forbids eating pork.
If someone says they dislike Muslims because they can commit X,Y and Z acts, but those acts are strictly forbidden in Islam. Then that is Islamophobia. Christopher Hitchens is wrong and wasn't a very good philosopher.