From the paragraph, imperious means commanding and dorminating. That means the person have an attitude of superiority or authority and expecting the others to obey them.
It shows that they person have a proud feeling, bossy or arrogant overall.
the answer is snubbed because slighted means to be rude or disrespectful and snubbed is to ignore someone and in most peoples opinions ignoring someone is disrespectful so I feel like that would be the answer