Once you use a title when addressing another person you are putting them in a position of authority over you. You give them a title and they are immediately in a higher position in societal terms.
I can see what you're saying as it's how in the UK we would address teachers etc, but unless someone has the in-laws from hell, I'm guessing that it wouldn't take that long after first addressing them as Pan/Pani, for them to want to be called by first names. If they don't, then how they are addressed is likely to be the least problem someone will have.
People here say it's a respect thing. Well, the problem there is that you've been raised to think in that blinkered kind of way.
Is it so hard to address someone as Pan/Pani? What do you say to someone if you go into a shop and ask the assistant if they have something? It's considered rude to use 'ty'. It's hardly the end of the world is it?
Respect is a two-way street and once you use titles and they aren't reciprocated then you're never going to get the respect you deserve and never be on the same level playing field as the person you're addressing.
Agreed, it is. If it isn't reciprocated after some time, I would suspect that possibly you are not their favourite person.