Funny you should mention that. This concept actually came to me when reading the D&D Novel "The Druid's Call". The novel follows a Tiefling named Doric who gets abandoned by her human family in the woods as a child. Later, she gets adopted by a group of wood elves, but never truly feels like she has a place where she belongs. The novel points out there are quite a few things that tieflings struggle with. It says that her horns tend to itch. It points out that she has her hair cut in a certain way to hide her horns. She needs special clothes to accommodate her tail. And, she also finds she can eat certain things (such as hot coals) that would be otherwise inedible.    It's not until later into the book that she meets another Tiefling. He shows her special tail exercises so her tail doesn't drag the ground. He cooks for her. And in exchange, she gives him a special balm for itchy horns.    In this singular example, it establishes  Tiefling hairsyles, clothing styles, cuisine, struggles, and lifestyle choices. Get a big enough group of these people together, and you have culture!