What does Of all the people to allude to reality mean?

Last week,my daughter made a comment on facebook about getting her cartilage pierced.I said it looks nice,now if only we could get your real sister to get hers done.My sister's husband made a comment saying Ironic post is ironic.Of all the people to allude to reality.Now my sister and I do not get along because she wants a baby and hasn't been able to yet and is jealous of me.My daughter lives with my parents a few states away and my sister and her husband live 4 blocks away from her.My sister and my daughter are close.I want to know is he being mean to me when he says the part about Of all the people to allude to reality? Is he basically saying Of all the people to pretend or hinting that I am living in a fake world? I don't want to reply until I know what he meant by saying that.I assume he was talking to me,making an indirect reference to the fact that his wife,my sister is her sister now since they all moved 3 years ago to a few states away.I want to reply but need to make sure of exactly what he was saying.Please help me.