[He couldn't believe the words he was hearing come out of his father's mouth. It was filling him with anger that Vegeta might see Trunks' eyes changing color.]

You've told me multiple times how proud you are of me, yet then you turn around and say things like this. Of course I already know that... [Then he begins raising his voice, the anger tone obvious.] But you don't seem to realize how hard it is for me! I can't smile when I'm hurting inside no matter how hard I try to get over it! You're so unsympathetic and I hate it!

[Yeah, now his hair might be standing up slightly and changing color too. He's that angry.]