Sab middle class hai kya? ( Is everyone middle class ? )

I have seen people claiming earning 20k pm making claims they are middle class and people making 150k pm calling themselves as a middle class. I read numerous articles and reddit posts but did get any satisfactory answer.

I am not satisfied with the math of calling people who is middle class or not. I saw a video on youtube where the person was claiming if you have a family of 4 people and make less than 200k pm then you're not middle class which means average around 50k per month for a single person and which I think is kind of true. What do you think buddies?