No need to get defensive - I wasn't talking about you personally, in fact you'd be the EXACT person that is the exception to this rule! But asking random people "why do you pronounce words this way" is bound to be (a) fruitless (do your non-linguist friends generally know the origin stories of every dialect difference between them and whatever the "standard" version of the language is?) and (b) possibly a microaggression/microinsult because it implies that their dialect is somehow "lesser" than the one you're comparing it to.
For example, if you have Indian colleagues, in India or in your country, would you ask them "why do you pronounce (insert word here) differently than we in (insert your home country here) do?"
It might come from a place of genuine cultural interest, but I wouldn't expect anyone to assume that.
So that's where I leave this discussion. I've made my point, people are free to choose to absorb it and think it over and incorporate it into their beliefs if they want. If not, not my loss.