You know its not even about feeling what the Fe type wants you to feel. I don't even think they want you to feel anything, not truly. They just want to see you feeling something through your expressions. Something I've learned with alpha types is that you can really easily fake Fe for them. As long as you are pretending to be happy for them (and as long as they can't access your true sentiments via Si), then you are good to go.
Awesome! Wow! Very cool!
You don't need to FEEL happy, you just need to SHOW that you feel happy with a smile. Or you show saddness with a frown. Even looking visually confused when confused, or singing a song when in a good mood. I know it seems insincere, but it works for them. I know this is going to sound harsh, but alpha types are stupid about this sort of thing, with the exception being a clever ILE. You really can fake Fe around them and they would never discern the difference between your expressed emotions and your real emotions (ignored Fi).
However, this does not work on betas and if it did then only the LSI (as they are most vulnerable to manipulative Fe, which is partly why ESE is their semi dual). Betas Fe is closely linked with authenticity and so they are scanning you for the truth. Not much you express can be faked on them.
What this means for Fe polr from what I've noticed is that although they may not pretend Fe, when they are expressive it usual shows a real authenticity of spirit.
So with the ESE conflictor when they go "oh come on, its funny, why aren't your laughing??" You know to just laugh. Fake it.