Only if you use a stupid utility function.
Utilitarianism doesn't use any particular utility function. It merely advocates acting based on an aggregation of pre-existing utility functions. So whether or not someone's utility function is stupid is not something utilitarianism can control. If people in general have stupid utility functions, then preference utilitarianism will advocate stupid things.
In any case, the problem I was hinting at in the grandparent is known in the literature (following Rawls) as "utilitarianism doesn't respect the separateness of persons." For utilitarianism, what...
Haven't had one of these for awhile. This thread is for questions or comments that you've felt silly about not knowing/understanding. Let's try to exchange info that seems obvious, knowing that due to the illusion of transparency it really isn't so obvious!