A nuisance
It is ridiculous to say that these kinds of people are not hard to come across, they are everywhere, selling medicines for the magical cure of long disturbing diseases, of the diseases that you would feel ashamed to describe to a person. They sell medicines which are very injurious to health. They speak in the most vulgar way trying to cash in using cheap jokes. These 'doctors' are male and the 'patients' are male. So the medicine sellers seduce the people by speaking about the male-female relations in the most obscene way.
Women passing by the selling places may feel molested by the words. Men passing by also, I believe, do not gather any nice experience. These people sit in the places like pavements and clog the footpath.
They must be driven away.