As with most "love it or leave it" arguments, this is a transparent attempt to silence critics without actually bothering to engage with criticism, even if it's constructive.
Anything you put in front of a significant number of people will be criticized, and rightly so, because it's not perfect. Admitting things aren't perfect is the first step to making things better.
This argument is particularly disigenuous in the context of a discussion about YouTube, because YouTube is effectively a monopoly in a number of ways--it's effectively an argument that once a product reaches monopoly status, it can do whatever it wants and nobody can criticize.
Adults learn to accept, integrate, and throttle their intake of criticism. If you haven't, you have some growing up to do.