How much is too much to blow on a new ‘do? Ever since Rep. Alexandria Ocasio-Cortez got the $260 cut and color heard ’round the world, reactions have been mixed. Detractors accuse her of “champagne socialism,” while others argue the price tag is within reason for a public figure — and a New Yorker at that. “I don’t think it’s outlandish,” megastylist Scott Buchanan tells The Post. Prices at his five NYC-area Scott J salons start at $75 for a cut and $90 for color, with lowlights such as the ones AOC received starting at $160. He also notes that...