...but it wasn't constructive?
It may or may not be valid criticism, but it's certainly not constructive. How is OP supposed to change based off your comment? Do you really think they learned something from it?
constructive
kuhn-struhk-tiv
helping to improve; promoting further development or advancements
Has being told to come up with higher effort ideas ever helped you to improve your work? It's never helped me, I've only ever been frustrated by it
...but it wasn't constructive?
It may or may not be valid criticism, but it's certainly not constructive. How is OP supposed to change based off your comment? Do you really think they learned something from it?
constructive
kuhn-struhk-tiv
helping to improve; promoting further development or advancements
Has being told to come up with higher effort ideas ever helped you to improve your work? It's never helped me, I've only ever been frustrated by it