When people stick their fingers in their ears and start singing 'la la la la la la' very loudly, (figuratively speaking) we have to take the hint that the person (for whatever reason) doesn't want to hear what you're trying to discuss with them. It's incredibly frustrating when you know that they really need to hear what you've got to say. It's like trying to get your neighbour to look at the puddle of brake fluid under their car - they hear you, but they don't look!
I'm at that point with three or four in the cong with whom I have little discussions about various Scriptures. They agree on most things, but then the shutters come down. They simply do not want to confront the 'truth' with Bible truth! The outcome might cause too big a burden.
So I've decided to let them remove the veil themselves - they don't require any help right now. It's like 'The Road Less Travelled' written by M. Scott Peck. No matter what evasive action you take to avoid dealing with an uncomfortable obstacle on your road in life, sooner or later you will be confronted with it again. So it's better to deal with it quickly, and get on with living!