A vulgarizer is someone who brings something down to a crude or common level. There are many synonyms that can be used to describe a vulgarizer, including: debaser, coarsener, cheapener, gutter mouth, uncultured, unrefined, tasteless, uncivilized, ill-bred, and lowbrow. Each of these words describes someone who lacks sophistication, refinement, or elegance and instead resorts to crude or tasteless behavior. Whether it's their speech, behavior, or general demeanor, a vulgarizer is someone who brings negativity and coarseness to situations that could benefit from a more elevated approach. Using any of these synonyms can help add nuance to your writing and accurately describe the behavior of someone who is vulgarizing the situation.