How was Sophism portrayed in contemporary Greek literature?

Sophism was the philosophical and cultural movement that developed in Classical Greece between the 5th and 4th centuries BC. The major exponents of this philosophical movement were Protagoras and Gorgias. Their skills of speech in public and their controversial relativistic theories (Protagoras would say that man is the measure of everything) would make them an easy target of the public. Another example more difficult to analyze would be the Socratic thought (Socrates himself never wrote anything but his close relationship with the youths of Athens and his teachings were judged dangerous by the community of Athens). In "The Clouds" by Aristophanes, for example, not only is he ridiculed but he is portrayed as greedy and as a hoaxer. Other public speakers, such as Isocrates, were firmly against sophists and other schools of thought that would teach easy ways to capture the attention of audiences during public speeches.