Like I said above, this will be a pretty major paradigm shift. Grungy work might go from being some of the lowest-paid to some of the highest-paid, simply because nobody actually has to do it anymore. Therefore while I do support moving toward a UBI, I wouldn't start it at $1,000/month. That would create quite a bit of chaos with masses of people leaving their jobs all at once. I'd start it much lower and gradually ramp it up so that employers and employees have a chance to adapt to the new normal.
Just to close this chapter: Nobody, absolutely nobody, is saying we should make a drastic switch, going from 0$ today to 1000$ on the 1.1.2020.
Everyone, especially the proponents of an UBI, is aware that this would be the biggest socio-economic shift since the end of slavery (which btw. has still not been eradicated, even if you don't count 12*7 sweatshops in Bangladesh).
It is a decade long project.
End of this.
I think the biggest emotional problem ist the beggar-giver one. We basically have 2 systems today: The "insurances" like for health, where (nearly) nobody is going against the solidarity principle. We don't say: People that no longer work are excluded from health care, especially since they create the most cost. This is just unmoral.
The second sort of system is basically a beggar system: You have to proof that you are in need, that you deserve a help.
This is a power structure, which should not be underestimated. As a unemployed, you are under stronger obervations, scrutinity and orders than even when you sell your body and mind to an employer.
It is a power structure based on the one giving and the one receiving. Ever wondered why beggars sit on the earth (and not e.g. on a podest) and look down?
Would people give to a beggar that stands and looks them in the eyes? Most would not. Because that would mean they are giving to an equal, and you can't have "monetary pity" with someone equal. With giving you are establishing a power structure of dominance (quite similar to ancient patronage system) and can still feel good about it.
If you give unconditional, in that very moment, you declare that all those people receiving the UBI are your equal. The giving changes from a posture of superior sympathy to a posture of obligation. It changes from a "compassion" that is given to a right that is exercised. Which of course, for many people, means a degrading of their own worth.
It is actually quite comparable to the fight for the voting right for women (or Blacks going in "white" schools etc.)