I'm not going to open the door for an elderly man
Why won't you open the door for an elderly man?
I just don't wan to.
You are being disrespectful to your elders by not opening the door for the man. Opening the door is a simple gesture and you should do it.
Well, I'm trying to be a better person. I'll try to open the door next time.
It is good that you are trying to be better. Opening the door for someone is a small gesture that can go a long way.