Oh! I think I see where we're talking past each other now.
I agree someone else's pleasure response is not a valid premise upon which to base MY choices and rejections.
If spinach doesn't give YOU pleasure, your body is telling you to avoid it - for now at least. It might be mental pain (some childhood memory affixed to spinach gives you pain) or biological pain (digestive issues?). You can always try again later *IF* you want to. Maybe you've heard it's healthy and you're willing to experience some pain now for pleasure (more health) later.
BUT *every* human and other animal has the experience of pleasure or pain by their very nature of being alive. You can see paramecia - one celled "animals" - have a rudimentary pain/pleasure attraction/avoidance response to stimuli. It's Ancient! That's why Epicurus uses it as a *standard.* By observation, he's seen animals react to things: they are either attracted to things for pleasure or flee from them if they cause pain. This is a reliable yardstick to listen to to decide your choices.