Ga maksud ego

Today i went to seminar there's i met my friends finished seminar we discussed about my friend birthday her name C who not be there.
Each one of my friend said:
A: Hey i have good idea "How about underpants?, i think C will like it. Do you agree??
I'm answer "
I : "yes i agree''.
Then my friends say
A: Ok. let's go to Detoz Mall. We will get it.
I : I'm sorry, i agree with u but i can't join to you to go to detoz mall
A: Hey Mely.. you are crazy. C is our friend. Don't you intend to give something?
I : I want give her, but i can't go now. I must go home.
A: I don't understand  with you.
I : Please understand me! i will buy some thing for her but i can't do it now
A: Up to you! (His face changed red and look angry)
Althought what A attitude hurt me, but i don't care, i not want maked dizzy. For me giving real reason to A that showed I not wrong. So,, If you angry to me it's your  problem but it doesn't mean that i must felt fall down.
Cause its I always smiling for every day.
:)