When I ignore someone I care for, it is because I do not know how else to be, discomfort, instability within relationship, I could be mulling over what to do, how I want to continue. Etc. When I ignore someone who means nothing in my life, it's because I do not like them.
their boring , stupid or crazy usually.
If they do something I DON'T like.
Then I tell it to them or sometimes overlook it.