How does ponyboy personality's change from the start to end of the novel?I mean did he become meaner and angrier?

At the beginning of the book, Ponyboy is in intelligent,
young teen, but he lacks the perspective to understand the environment around him.  He
can only see his side of the story and fails to understand why others act the way they
do.  The first example of this is his oldest brother Darry.  He thinks Darry hates him
because he is always giving Ponyboy a hard time about his lack of common sense, his
grades, or any other thing Darry feels is unfit about him.  Therefore, he bears a bitter
resentment towards Darry and feels Darry holds the same hostility for him, assuming he
is a nuisance that Darry would rather not deal with.

By the
end, through many life changing experiences and with the help of friends, Ponyboy is
able to see Darry treats him the way he does out of love and conern.  When they reunite
at the hospital after the fire, Pony boy sees Darry's concern for him and realizes he
loved him this whole time.  He realizes Darry feels resonsible for Ponyboy's well being
and wants to avoid at all costs the separation of his already fractured family.  He can
also see Darry's other concern is he wants to make sure Ponyboy is safe and that's the
reason Darry gets upset with him when he acts irresponsibly in potentially dangerous
situations.

At first, Ponyboy's view of the Socs is a
stereotypical one.  He placed them all in one category of being spoiled, stuck up, and
hateful.  He came to this conclusion from the limited encounters he experienced with the
Socs.  However, once Randy got to know some Socs on a more personal level, he found they
are more varied and not nearly as one dimensional and he thought.  Cherrry Valance
taught him about how some Socs do care about things and others by expressing her concern
for Johnny, her interest in him, and her love of the sunsets.  She also explained to him
that just because someone is rich, doesn't mean he/she doesn't have problems.  Randy
Adderson also showed Ponyboy a more sensitive side of the Socs, when he went from a
heartless bully that participated in jumping Ponyboy and Johnny, to a scared and
lost boy grieving over his best friend's death and the endless violence stemming from
being a Soc.  Randy showed Ponyboy that there is no such thing as Greasers or Socs; they
are all just people.

Ponyboy's personality evolved into one
that is much more understanding of others, and because of that, he is now able to make
friends with people who are different than he is.