"Free $THING_OF_VALUE for everyone!" sounds a lot more palatable to the middle class than "You're going to be asked to kick in more in taxes to buy $THING_OF_VALUE for poor people."
This is true of food, education, and health care. It may also be true of "money."
I think I would consider myself a middle class, and I think I have two reasonable arguments why I dislike my "taxes buying $THING_OF_VALUE" for poor people.
1. this implies my taxes need to pay for somebody deciding who is poor or not
2. the decision if you are poor (and get or not get the $THING) tends to be binary
I have met a few people who were surviving only on some goverment support, that felt that any attempt to integrate back to the work-force would force some imagnary switch to be flipped that cuts them off from welfare and leave them worse off even when they have salary.
From my perspective UBI and negative income tax can have implementations similar enough in attempting to solve this problem.
This is true of food, education, and health care. It may also be true of "money."