A Turkish pop singer accused of “inciting hatred and enmity” with a joke about Turkey’s religious schools rejected the charge Friday during her first court appearance. Singer-songwriter Gulsen was charged and briefly jailed over the joke she made during a concert in April, when she quipped that the “perversion” of one of her musicians came from attending a religious school. The 46-year-old singer, whose full name is Gulsen Colakoglu, was taken away from her Istanbul home in August after a video from the concert began circulating on social media, with a hashtag calling for her arrest. She was j…