I’ve read comments like these hundreds of times and the takeaway is always that the commenter has fooled themselves into thinking they are some paragon of self-reliance. This is mixed with a big dose of survivorship bias: they believe they were self reliant and that their success was their own, so why can’t other people just also be self reliant?
If you have a high paying job because you have a fancy degree from a college or university, you were reliant on the institutions built by your country. If you own a business, you’re relying on roads and other infrastructure that has been socialized. If you were breast-fed as a child or had someone to buy you formula, you are not self-reliant. Obama used the phrase “You didn’t build that” and it made a lot of people very mad because they, and likely this commenter, have zero respect for the institutions and resources (state institutions, family, community, etc) that have made their success possible. Claims about “self-reliance” are just another way that capitalists, and especially conservatives, shield themselves from any responsibility for the real issues plaguing the US and the broader world today.