There have been a few threads along these lines.
I think some people had said they thought people were ignoring them because they just didn't want to engage. It's like some people think not saying anything is better than potentially saying something wrong. One would think they could give a compliment without somehow being hurtful, but there are many who don't seem to have that skill or tact.
Keep on doing what you know is right and you'll get there. When they think it's 'safe' to make a comment, they will.
Hang in there!!!