I have to agree with the previous posters. Like human babies, baby birds grow and they change... Do you have children? Because, if you have a little boy, you know that they would kiss you and hug you galore when they are little but, as soon as they start growing up, they start resisting and even 'wipe' your kiss of their cheek because they are '"not a baby!". Also, just like small children, they don't like screams, sudden movements or any type of threatening behavior - even if it's directed to another animal or person. My Mami YFA and Sophie CAG will scold us loudly when my husband and I argue (Sophie even tells us to be quiet - she says it "QWET! QWET!"
). They are very smart as well as masters of the human body language and tones of voice and know when we are talking 'nice' or when we are talking 'mean'. But they are also very loving and forgiving and I am sure that, if this is the problem, he will forgive you. Just keep on spending 3 to 4 hours of one-on-one time with him every day (better time is after their breakfast or before sunset) and everything will be OK.