I only speak for myself - but in my games, I do not allow Dragonborns, Half-orcs & Tieflings. I run a forgotton realm setting using a lot of the known lore. Usually those 3 races has a lot of issues with society. Half-orcs are on a case by case basis but they are looked down upon by society. Tiefling are even worse and dragonborns will scare most npc and are extremely rare. I will allow them if they party agrees the troublesome that they bring in a social setting & rolling "persuasion" won't help them.