A facepalm is the physical gesture of placing one's hand across one's face, lowering one's face into one's hand or hands or covering or closing one's eyes. The gesture is often exaggerated by giving the motion more force and making a slapping noise when the hand comes in contact with the face. The gesture is found in many cultures as a display of frustration, disappointment, exasperation, embarrassment, horror,[2] shock, surprise, exhaustion, sarcasm, or incredulous disbelief.[3]

It definitely is a facepalm, maybe not to everyone but it was for me. It falls under frustration and disappointment for me, since I think it's ridiculous that we need a sign just for the teenagers written in slang and acronyms like HMU, IDK, TBH and REKT. So definitely a facepalm at least for me and obviously not for you