What descriptor fits a speech that is excessively critical and often harsh?

The term that best fits a speech that is excessively critical and often harsh is "tirade." A tirade refers to a long, angry speech of criticism or accusation. This word evokes a sense of a passionate outpouring of negative sentiments, often characterized by frustration and intensity. It suggests not just criticism, but a vigorous and vehement delivery, which aligns perfectly with the description of a harsh speech.

In contrast, utility pertains to usefulness or practicality, which doesn't relate to the nature of the speech. Arrogance indicates a sense of superiority and self-importance, and while it may accompany a tirade, it is not a descriptor of the speech itself. Trite refers to something that is overused and lacking in originality, which again does not connect with the critical or harsh aspects of the speech described. Thus, "tirade" stands out as the most fitting choice for a speech characterized by excessive and harsh criticism.