Don’t call Tumblr mogul David Karp a “hipster.” The 26-year-old, shaggy-haired CEO — who sold his site to Yahoo for $1.1 billion — scolded ABC’s George Stephanopoulos yesterday for branding him “the original hipster CEO.” “I don’t know about ‘hipster,’ ” Karp scoffed. “I don’t know if I really appreciate that one.” Square Stephanopoulos asked, “That doesn’t work for you?” Karp, a Bronx HS of Science dropout, rolled his eyes, shrugged and replied, “I prefer not.” The Upper West Sider appeared on the morning show with Yahoo CEO Marissa Mayer, who said, “You don’t do a transaction like this for perception, you do it because they have great technology and great community and content, and it fits really well with ours.”