I have been asking a lot about optional back shifting. I understand that if what is said is still true at the time of reporting then back shifting of tense is optional. I just have one doubt. If what is said is no longer true, then colloquially and conversationally will it be acceptable to avoid back shifting of tense ?
P.S. -- I know while writing it would be wrong to not back shift the tense if what is said is no longer true.