It was originally pointed out as a means to discredit the achievement of creating Amazon, as though that investment is the only reason or even the main reason he was successful, and anybody could have done it if they had the same opportunity. That's clearly nonsense, for two reasons. One, plenty of others could have got the same investment from their family. In countries like the US it's not uncommon for people of that age to have that kind of money saved up. The median wealth of a retiree in the US is just under $250k. Two, and much more importantly, his parents' investment was not some unbeatable advantage. Bezos was raising funds from multiple sources, most of which anybody could go to. He valued Amazon at $5 million and he got 22 investors signed up, including his parents, and gave them 1% for every $50k. Had his parents not invested it wouldn't have made any difference. He still would have raised the money and Amazon still would be what it is today.
It's driven by little more than jealousy and isn't particularly surprising from that poster.