I would much rather know the real reason, even if it's offensive or hurtful, than to wonder about it forever. And at least that way I know what's not working.
Most Helpful Guy
When they do it with no explanation, that is literally the worst thing you can do. Tell them the reason. Treat them like a respectable human being. Don't ignore and avoid them and treat them like a damn plague, or a disease. Some people don't realize just how deep that can cut.2