Earlier quoted context omitted.
I just posted this on a probably-dead thread about caste discrimination, but the short of it is the folks who wish to discriminate by caste have a variety of ways to determine what your caste is. From the Vice article below: Indians will not ask outright what caste you are, as it’s seen as overly discriminatory, but they use more subtle methods to identify your place in the caste structure. “Sometimes they ask, ‘Are…
What happens if you are from a lower caste but wear the white thread to misdirect? Or you lie about being / not being vegetarian by choice / at birth?
You could misdirect someone just passively asking, however as soon as the questions got more pointed, you'd have a hard time keeping up the charade.
Something as simple as the clothes you wear or the food you ate or the mannerisms you had could "give you up".