By Bonnie Stiernberg On Friday, Lizzo released her new single, “GRRRLS,” from her forthcoming album Special. But over the weekend, she faced backlash from fans who took issue with her use of an ableist slur in the track’s lyrics. The slur in question — “spaz,” from a portion in the song where Lizzo sings, “Hold my bag, bitch, hold my bag/Do you see this shit? I’ma spaz” — is often used as a derogatory term for someone with cerebral palsy. Many fans took to social media to call out the musician for using the word and point out why it’s harmful to the disability and mental illness communities. A…