"To be greeted with stares and whispers, to suffer violence and insult on the street, to see mistrust and fear in every eye...."
"....Their appearance and their nature are not their fault but the result of an ancient sin, for which they and their children and their children's children will always be held accountable."
"Tieflings subsist in small minorities found mostly in human cities or towns, often in the roughest quarters of those places, where they grow up to be swindlers, thieves, or crime lords"
And in combination with that, the extremely over the top physical change from 2e/3e to 4e, results in a lineage that is seemingly always to be judged as other, and pushed to the fringes of any human society they are allowed to settle in.
Its a bad look, imo.