Why was telemachus indignant when he saw Athena on the threshold of the outer porch?

Telemachus was indignant upon seeing Athena on the threshold of the outer porch because he initially mistook her for a stranger and felt insulted by her sudden appearance in his home. His surprise was compounded by the fact that he was dealing with the turmoil of his father's absence and the raucous behavior of the suitors. Telemachus's indignation reflected his frustration and confusion about his situation, as he longed for guidance and support in reclaiming his father's estate. Ultimately, Athena's divine presence was meant to inspire and assist him, despite his initial feelings of indignation.