alt Hacker NewsYou not wanting to work "shit jobs" (without compensation you would consider excessive) doesn't mean that everybody doesn't want to work them (or even that everybody considers them to be "shit jobs").
I agree with your point about commercial productivity. I don't agree that it would crash the economy: it would crash GDP (by eliminating large classes of exploitative and abusive behaviour which currently prop GDP up), but we already know that GDP is a flawed metric. I don't see how this would interfere with food getting to our tables, buildings being built, or communal infrastructure being maintained, except that monied folk would be less able to demand that things be done "or else", so we might have to reorganise society somewhat (such as by providing better working conditions for "shit jobs").
I wouldn't want to clean public toilets if I didn't need to do so. You'd be willing to do it for free. I think one of our views runs rather closer to the overwhelming majority of people, like 99.999%, than the other. This issue is really not the one you want to argue. But I understand that you have to argue it, because if you simply accepted this point then you must accept the fundamental problem. When everybody starts demanding substantial amounts of money for any labor they don't want to do, you're not only going to crash your gdp but see hyperinflation as well.
Now not only is the basic income pointless because it's no longer enough to afford anything (and increasing it further just sends you closer to Zimbabwe), but you'd also completely crash your currency meaning you'd also no longer be able to afford any imports (though exporters would be getting filthy rich - see: why China intentionally devalues their own currency). The country would be obligated to rapidly transition, formally or informally, to another currency as the default unit of trade for anything of value, further nullifying the basic income.