vulgariser
/ˈvʌɡəraɪˌzaɪzər/Definitions
1. noun
A person who uses or promotes coarse or offensive language.
“The comedian’s intention was not to vulgarise the audience, but to shock and provoke.”
2. verb
To make something seem crude or unrefined by introducing coarse or off-color language.
“The writer was accused of vulgarising the novel to attract a younger audience.”