Two techniques that can be applied in writing or orally for indirectly criticizing someone or something are
sarcasm
verbal irony
connotation
tone

Explanation:

Sarcasm is the utilization of comments that obviously mean the opposite they state, made so as to offend someone or to scrutinize something hilariously.  

Verbal irony happens when individuals state one thing yet mean another.  It enables perusers to practice a tad of recognition and omniscience.

expository writing is one of the most common types of writing.

boccaccio employs the voice of his narrator dioneo to represent his ideas on the tension between masculinity and femininity.  while dioneo excites the members of the brigata and recognizes women for their unique skills and independent ideas, he concludes the decameron with a story reminiscent of the society from which these young aristocrats escaped, revealing misogynistic overtones.  dioneo boccaccio is able to explore the gender disparity which is inherent in 14th century florentine society.