It's not that millennials have an "inability to understand the way the world works" — it's that previous generations have structured the world in such a way that it primarily benefits them, often to the detriment of younger generations. Millennials are just sick of playing the boomers' game.
Inflation is not a tax: there is no government entity that collects inflation payments.
Not having any money is worse for the poor than having a basic income, even if there is inflation. The market has no direct incentive to serve those without money. The alleviation of widespread human suffering due to poverty and the massive increase in the general utility of the market to humans clearly makes UBI the moral choice.
Inflation does benefit debtors: with money being cheaper, loans are easier to pay off.
Yes, UBI would likely contribute to some inflation -- a little bit of inflation is good, necessary, and unavoidable. It would also act as a massive stimulus to the economy, while also empowering economically-disenfranchised people to enter into the market, from which they are barred from participating in without money.
One way to fund a UBI would be through a value-added tax, which would be collected at every stage of production where money is exchanged.
Yes, so we should be less like animals. People should be allowed to live without having to "earn a living" -- the daily struggle for survival would be abolished by UBI.
UBI would not abolish money. It would actually create more money for everyone, and having a guaranteed minimum income would allow people to enter into employment relationships on a purely voluntary basis, because they would have the option to abstain from work.