If they love to Play an all evil campaign it is no Problem at all, but if they do the drizzt mob turned-into-good-guy Routine then i suggest chose Eberron as a setting, they allow humanoids being on the right side of things.
If someone at my table insists on playing a dragonborn or drow or in some cases even a halforc or tiefling (which i consider to be the least mob like because guess what, they are half human also) and it is a Setting like FR or GHK or DL then he is informed by me that many if not most of the normal Folks sees a mob in him first and will run away /try to kill him / refuse to ineract with him AND the Party will be considered evil at first glance.
Even more so in Ravenloft, there even elves or dwarves might have those Problems.
Also in e.g. FR dwarves and elves will not get along easy in my games. The least is a bit of banter, but there might even be occassionally hostility depending on local history.
If someone at my table insists on playing a dragonborn or drow or in some cases even a halforc or tiefling (which i consider to be the least mob like because guess what, they are half human also) and it is a Setting like FR or GHK or DL then he is informed by me that many if not most of the normal Folks sees a mob in him first and will run away /try to kill him / refuse to ineract with him AND the Party will be considered evil at first glance.
Even more so in Ravenloft, there even elves or dwarves might have those Problems.
Also in e.g. FR dwarves and elves will not get along easy in my games. The least is a bit of banter, but there might even be occassionally hostility depending on local history.