We can't just simply say to others not to complain.
There are people who are now at the bottom because of Covid-19 and got affected by what it brings to the economy. Yes, with or without Covid, the economy can fall but this time, it's different.
I know people are working hard to make some adjustments and make their living as normal as before as they don't have a choice. They stay positive even in hard times and that's good.
We can't avoid complains entirely because we are not living in a utopian society. For the OP, complains lead to the awareness of more people to an issue that could otherwise been ignored. Working hard should not be shamed although it is impractical, instead of telling them shit, why not just help them, many people are looking for mentors to guide a good life, all it takes is for someone to heed the call and help them. Knowledge and information will not help you if you do not have social connections.