Why did the Trojans scoff ant Casandra's warning?

The Trojans scoffed at Cassandra's warnings due to a combination of her cursed gift of prophecy and their own hubris. After being cursed by Apollo to always speak the truth but never be believed, her dire predictions about the dangers of the Greek wooden horse went unheeded. Additionally, the Trojans were overconfident after their victory in the war and dismissive of any further threats. This disbelief ultimately led to their downfall when the Greeks infiltrated the city.