Did Rihanna make fun of Amanda Bynes' mental illness on Instagram?

One of Rihanna's fans posted this picture on Instagram of the pop star and Amanda Bynes using lyrics from Rihanna's new collab with Eminem, "The Monster." The lyrics refer to someone thinking it's not fair when someone thinks they are "crazy." Rihanna then commented on the photo saying "Its NOTHING!!" Was she making fun of Amanda's mental illness issues which recently left Amanda in treatment since July?

RiRi............gorl. Ily but this is nagl.