Medieval law acknowledged that social insult discouraged Muslim conversion

Evidence

The Siete partidas also attempts to facilitate the voluntary conversion of Muslims to Christianity. No one may prevent a Muslim from converting to Christianity (law 2), or call the convert tornadizo (turncoat), or insult him (law 3). Fear of such insults prevents Muslims from converting to Christianity, even those who “since they possess comprehension, acknowledge the superiority our faith.” — John V. Tolan, Saracens, 981