I'm saying it depends on what A is criticizing about B. It is not sinister for A to criticize B's action. I'm not sure if it's sinister for A to criticize B's misallocation of time spent. It's a weird thing to think about. I think it's weird to think about because, as was my point earlier, the judgment of whether the time was misspent is wholly dependent on the judgment of the way the time was spent.

A criticising B is not a problem.

A preventing B from doing something is sinister (life, liberty, pursuit of happiness).