How come my friend is ignoring me?
That's interesting. How do you know that he is ignoring you?
He has been ignoring me since I spoke down to him in a harsh voice.
You should apologize to him for the way you spoke to him. It is understandable to want to ignore people who have hurt you. Making amends with your friend can help clear things up.
It's really not my fault. I think I was right, I deserve more respect and I am trying to upset him back a bit.
Maybe pay him a visit, and if that isn't possible, be persistent, and I am confident he will finally come around and bond with you. People occasionally require additional time to consider their options. I wouldn't be too concerned about it because most wounds heal with time.