> Is this cultural?

Many of my Indian friends say it is, but sometimes I feel they can be as self-critical of their country as many Americans are of the USA.

Demographics show that it doesn't have to be cultural - it could just be that India has 9x as many people under the age of 35 compared to the USA. Even if we were culturally similar, for every annoying US youngster "hustling" to try to get employment, there would be 9 early-career Indians doing the same. That alone is enough to drown the "Vox Agora" with Indian voices. Chinese citizens generally don't participate in English-language fora, so their large numbers would be massively under-represented.

If anything else is biasing the populations, the difference in numbers could be even more stark.