Soho has seen a lot of conflict lately, what with the fight over the Grand St. bike lane and the Soho Alliance criticizing the Soho Partnership for accepting funding from the Trump Soho condo-hotel, not to mention the flying cell phones at Downtown Independent Democrats endorsement votes. But Dondi McKellar a.k.a. The Soho Bubble Man is a smiling sea of calm — and a flurry of bubbles — amid the storm. He has sold his battery-powered bubble guns, $5 each (batteries extra), at Spring St. and Broadway for the past four years. And if you buy $10 of his rainbow items, he’ll kick in a free bottle of neon bubbles — great for use in nightclubs. He said he sells two boxes’ worth of bubble guns, or 96 of them, daily, and could sell even more on Canal St., but loves his spot. Asked about all the discord in Soho, the beaming Bubble Man said, “Right — I try to relieve that.”