The phrase "Check Your Privilege" does very little good and a lot of harm. It usually does nothing other than provide a common way to end an argument without actually providing any evidence, and assumes the asker is more "privileged" than the receiver, which is usually a fallacy, anyway. This is probably the least harmful way I've seen it used, however. "Check your privilege" is used to drive away allies toward any cause. It's hard to be an ally for any sort of minorities when people are constantly screaming "CHECK YOUR PRIVILEGE" whenever you post anything. A woman posted on how she wore a hijab for a day, so that she could see the struggles some minorities faced. She was called a know-nothing who needs to check her privilege. Most actual people who are minorities (racial, gay, etc.) don't like the use of it anyway, but the few refuse to listen. The worst thing is that it is used as a witchhunt against people with mental disorders, such as depression. Many so called "social justice warriors" say that white, straight, cisgender, or even thin people do not "have the right" to have depression, bipolar disorder, anxiety disorders, or the like, but, truthfully, mental disorders do not pick and choose; they do not select based on "privilege". The worst case was probably the case of a 14-year-old girl known as "Aly" online. She was half-white and half-Latina, but had pale skin. Her parents couldn't care for her, so she lived with relatives and was technically in foster care. Aly had cancer, but didn't want to trouble her financially struggling relatives, so she would take less of her pain-reliever than she was supposed to. She would post about her struggles, along with other posts, but "social justice warriors" would send her hate messages, telling her she did not know what struggle was because she was pale-skinned, straight, thin, and cisgender and that she should "check her privilege". Over time, the insults escalated to death threats and messages telling her to kill herself. Aly didn't let them get to her, and continued on. Eventually, her caretaker posted saying that she had been brought to the hospital in critical condition from the cancer and was in a medically induced coma. Two months later, Aly was out of the coma and at a facility recovering. That was the last we got, she may be dead, I don't know. I guess the people who sent her hate were happy when she came so close to death, because she didn't check her privilege! How dare she!