Everyone has the right to complain about their salary. The NFL is a HUGE business, with owners raking in a LOT of dough solely from the performance of he players on the field. The players have every right to want to make more money. Does it mean they will necessarily get it? Not really, but they have the right to complain about it.
The median salary in this country is a little over 50k, so we look at guys like Bennett and say "hey, you make plenty of money", and yet a lot of us think we should make more as well, but then you have the rest of the world looking at us like we are insanely overpaid, considering the top 1% of global salaries is around 32k.
It's all about perspective. Bennett sees people who may not be as productive as him making as much or more than him and he thinks he's earned that as well. He also sees guys on his level getting mega deals that he's not getting. Salaries are rarely "fair". it's just the world we live in. Bennett is not holding out though, so if he wants to talk about his salary while still performing his duties, that's his choice.
Baldwin's comment about him talking about food on his kids plate while driving 10 cars, came off more like levity than calling him out, but that's just my opinion