"You can't fool me."
Despite all his confident smile and uncaring attitude toward his mother, Vernon was actually deeply hurt by Dorothea's accusation.
He knew that he wasn't a good man, nor was he a good son. But Vincent was even worse than him, and Dorothea seemed to care for Vincent despite all the horrible stuff he did.
'Favoritism does exist,' Vernon thought. 'This old bitch never even cared for me when I was young. She was too busy drinking and crying like a madwoman.'
'Well, she was barely functioning by herself. She should be grateful that Chloe took care of me when I was young.'
He was also curious about Dorothea's relationship with Chloe.
From what he remembered, Dorothea absolutely despised Chloe because she didn't come from a good family, but Vincent insisted on marrying her, and she had gotten approval from Vaughn before his death, so nothing was stopping Vincent from marrying Chloe.
