THIS IS MY OPINION, PLEASE DO NOT GET YOUR NICKERS IN A TWIST
Im pretty sure these are used as a form of pride, not just a form of identification,
LGBT Pride was not born from a need to celebrate being LGBT, but from our right to live our lives free from persecution. Unfortionaltey straight people arent persecuted as much as LGBT people because it is considered normal, where as many poeple consider members of the LGBT community to be "abnormal" (luckily this isnt a BIG BIG issue anymore, but it still is an issue), and as such don't need any form of pride because they arent persecuted or oppressed, now im not saying that straight people should be proud of being straight, but they don't need a straight pride movement, and as such that is why there isnt a straight pride or cis pride badge on the forum.