On this Friday evening, Wiser is surrounded by wealthy folks who think similarly. The occasion is the annual meeting of a Boston-based group called Responsible Wealth, whose 700 members belong in the top 5 percent of wealth nationally and whose mission is to close the economic divide that it says has created a “second Gilded Age.” After a round of applause for the waitstaff and an MC’s mention of how the Westin was picked because it’s a union hotel, Bill Gates Sr. delivers a keynote address on the subject about which he has been stumping across the country: his opposition to repealing the estate tax. Over the following weekend, the crowd will go on to attend workshops with titles like “Freeze the Tax Cuts” and “Corporate Accountability.”