Culture is defined as socially transmitted
behavior patterns,
arts,
beliefs,
institutions, and all other products of human work and thought.
This would apply to the deaf community.
Within the deaf community is a wide variety of patterns, poetry, humor, and language.
The deaf have jokes that a hearing person would not understand without an explanation. They have poetry and musical talent.
Their language, American Sign Language here in America, has structure and expressive grammer. Not to mention many dialects and accents.
There is even proper etiquette for communicating to a deaf person through the sign language interpreter.
The deaf community has it's own culture and we must all learn to respect it.