Yep not much difference between letting in 6 or 7. Horrific performances obviously but an unlucky deflection or a bad bounce can make it 7 instead of 6, or save you from letting in a 7th. Doesn't really change what the manager has achieved in the majority of their other games.
People worry far too much about those 7 goals. I think they're confusing their own social embarrassment with what this means for United - which isn't too much.
If you step back a bit, a loss at Anfield is pretty always acceptable (not ideal, but acceptable), and this one came with a decent first half in which United were unlucky to be behind, followed by a poor second half. That happens, nothing crazy.
Of course, it did get to 7-0 and that's a bit extreme, but it's a fairly simple question for Ten Hag to address: why did the players lose their mental composure, and abandon his principles and rules? It's not the first time this has happened either, their have been various parts of games with similar situations - except with an opponent that pounced on that and made it worse.
So his task is to find a way to improve his players' steel and consistency. And if you want to be optimistic about things, this game may even have made that easier: previously, United won or drew games where that happened anyway, so the issue may have felt exaggerated to the players. This time, they certainly won't think that.
Other than that, the players shouldn't see this as a burden. That achieves nothing. The next match starts at 0-0 and needs to be approached as rigorously and composed as always. Overcompensating because yesterday was bad won't achieve anything, quite the opposite.