Why was arachne so unkind to Athena?

Arachne was unkind to Athena because she was overly confident in her weaving skills and boasted that she was a better weaver than the goddess herself. This arrogance led her to challenge Athena to a weaving contest, disrespecting the goddess's divine authority. Arachne's lack of humility and disrespect ultimately angered Athena, which resulted in severe consequences for her.