Question 1: no because bird #2 as he stretches he accidentally hits bird #1 so bird #1 gets mad and starts arguing with bird #2 Question 2: they don't like him because he is a different bird than them.
Question 3: He likes them and he wants to be friends with them. Even though the little birds start making fun of him. Question 4: Don't be rude to anybody just because they are different from you.
Question 5: The birds remind of humans because most people like teenagers make fun of other kids because they are different from them.