This is ridiculous. It has happened before and continues to be a thing. DTG pull your finger out and actually fix something. Also, why do we have to be signed in to play a game? I'm so god damn sick of this always online rubbish!
The only thing you need to be signed in for is Creator's Club and Mastery. If you don't mind stalling progress on those two aspects of the game, then you don't need to sign in for a while (until you want to continue your progress at some point).
It's annoying yes, but that's all it is. Your anger is misplaced. I'm sure DTG doesn't want this to continue and will solve it asap. A little patience is all you need. Just skip the sign -in for a while if it really upsets you.
Sign in, then log out from Dovetail Live in the Settings menu. Once you sign again in one last time it shouldn't bother you for a while.