keep it on display on your gifts page where you gave to see it all the damn time

Yes, rejecting a gift was created to allow people not to have to see spitefic or other viscerally upsetting content while scrolling their gifts. If you think "a fic written for me in good faith, that was also badly written" is equivalent to these, that is an emotional regulation problem. Or just sheer mind-blowing preteen entitlement.