"Homer has taught all other poets the art of telling lies skillfully."
Aristotle is saying that Homer's stories of gods and magic are lies. Aristotle is calling out not only Homer for lies but, all poets and story tellers. All of the myths are also false because of the made up animals and monsters. This is typical of Aristotle because philosophy is gods have no physical forms. He strongly believes in the fact gods have no physical form.
This is a part of humanism because it is moving away and ridiculing divine choice in individuals. This quote probably angered societies and governments like why Socrates was executed. I most likely extremely angered governments because the church and state were not separate. Plato was progressive in the no physical forms of gods and searched for the truth. The school Plato founded would later teach this for thousands of years.