can you elucidate your opinion ?

I don't understand the last part of what you said "So they should..." !?

but according to what I understood at the first part, I agree with you, If they were the first ones who had ignored you without reason and they turned around their faces, surely everyone has a dignity, you may try one time to greet them maybe they'll change their attitude, however if they do the same thing again, you don't have to make effort with them, anyway, you don't need such people

@Ayouur: i am talking about a female highschool classmate. We know each other for so many years.
I am not talking about a guy, who is afraid of staring at me, so I wouldn't notice that he is looking.

can you explain your point of vue :D