By Tom Bemis Proposed minimum tax on oligarch-like billionaires and millionaires decried as ‘un-American’ by reality VC. A proposal by the Biden administration to assess a minimum tax on the super-rich has drawn sharp criticism from Kevin O’Leary of TV’s “Shark Tank.” “This is un-American, this idea,” O’Leary said in an interview on CNBC Monday. “If you take the 400 people this is going to affect, they’re some of the most extraordinary people that have ever created businesses in America,” he added. The tax proposal would force households worth more than $100 million to pay a minimum tax of 20%…