system
Given the following post, respond as if you're commenting on Reddit:
human
Why is utilitarianism bad

All over the internet you constantly see people saying something is bad because "it's utilitarian" but the the whole concept of utilitarianism is to maximise pleasure and minimize pain. 

I would also like to mention I don't think it's plausible nor would I do it as it requires too much self sacrifice however that doesn't make it bad.
gpt
> the the whole concept of utilitarianism is to maximise pleasure and minimize pain.

This sounds great at face!

Here are some things we can that seem at face to significantly increase aggregate happiness: systematically execute the 5% of the population with the most chronic sadness, revoke all legal and moral notion of things like bodily autonomy and self-determination so that people's bodies and lives can be used in the service of most efficiently serving other people's satisfaction, morally oblige people to make themselves available for physical, emotional, or sexual abuse by any one person or group of people whose aggregate enjoyment of it would be greater than the suffering it produced.

There are a few options at this point, most obviously: bite the bullets and accept that things like these are morally obligatory, argue somehow that these things wouldn't significantly increase aggregate happiness after all, or modify the utilitarian thesis in some way that would exclude such results. People have tried, and continue to try, all three, which is why normative ethics is still a matter in some contention. But these considerations do undermine the intuition that it's just obvious that utilitarianism is correct -- or intuitions to something like this effect.