Why does everyone call themselves middle class in India?

I’m from Mumbai and I’ve heard ‘we’re a middle class family’ from my parents all the time growing up. Not a humble brag, but I don’t think people who can afford a 6cr house in Mumbai (Chembur suburb, albeit) are exactly middle class. Our maid aunty used to call herself middle class too and her living conditions were nowhere near ours. I don’t understand what’s with everyone calling themselves middle class? I wouldn’t really call my parents or my maid aunty middle class.