Be like Taylor Swift. Cultivate friendships with people outside of your ideological circle — and keep them. Last week she wrote self-professed Swiftie Dave Portnoy a thank-you note for always having her back. And it was hand-delivered by her brother to the Barstool Sports honcho at her Miami concert. Nice gesture, right? Nope. As with anything in the Swift universe, it’s caused an earthquake: spawning think pieces, social media reactions and tons of coverage.