You ask for the pictures.
Then you filter in the frontend if the user is in the flag array.
You don't want to load 80.000 images at the same time. Then you probably work with the nextToken.
What do you do now, if an array with 50 items is returned in the request, but all are blocked? Then the request was unnecessary. And you have to place another one and hope that in the next 50 there will be some that haven't been blocked yet.

How better to solve this?