I get my two asians friends mixed up, and I feel bad.

[Mariposa Electrique]

What should I do?

 

[RatCake]

Apologize and move on?

 

[BONE_Buddy]

Write an ID number on each of them with permanent marker. They are used to it.

 

[Lucky Jim]

Mix up other people besides them to make it look like it's not their fault

 

[Mega Man II Intro - GB]

Come up with a "nickname" you use for all your friends, like your equivalent of saying buddy. And just start calling them that all the time.