Perhaps it's not "passive aggressive" in terms of the DSM criteria but it's certainly not constructive:
1. it asserts authority ("right") rather directly addressing the underlying issue (the concerns the users of the bathroom have with hygiene and "pragmatic" efficiency)
2. it ends with the line, "Thank you for your co-operation", which is offensive and condescending because the author of the sign expects co-operation and consideration without offering any in turn because they are "right" (when clearly the target of the message doesn't care what's "right")
1. it asserts authority ("right") rather directly addressing the underlying issue (the concerns the users of the bathroom have with hygiene and "pragmatic" efficiency)
2. it ends with the line, "Thank you for your co-operation", which is offensive and condescending because the author of the sign expects co-operation and consideration without offering any in turn because they are "right" (when clearly the target of the message doesn't care what's "right")