You ever notice how only the really popular people with tons of fans and followers will tell you that validation doesn't matter? These are people who do not remember what it's like to put days, weeks, months or even years of effort into something, only to have nobody notice it. Even when you self-advertise, even if you're aggressive about making sure people see it, and it's still invisible. It baffles them to think that not everyone can just fart out anything and have a bazillion likes or faves or whatever within five seconds.
It's like a rich person telling a starving person that money can't buy happiness. Fuck you, check your privilege. Support independent talent when you can.