Without full context, it’s hard for me personally to lay blame any particular way. We’re only getting one side of the story, after all.
I’m of two minds about this. Yes, it absolutely sucks when a teammate whiffs an ultimate and then decides to deflect that by calling out others flaws. Depending on how hard they try to deflect it can turn from an eye rolling experience to a ‘Okay I’m muting you’ moment.
On the other hand, I’ve seen first hand that you can’t try and micromanage in this game. Nor should you really assume you have any ‘claim’ to doing so. At best you’ll get people who tell you politely to pound sand and then ignore you. At worst, you’ll tilt your team off the planet.