On Friday, Charli XCX kicked off her new musical era with “Rock Music.” Today, she pivots almost immediately with the release of the B-side, “I Keep Thinking About You Every Single Day And Night.” If we were to believe “Rock Music,” then the Brat superstar was headed toward the realm of rage-baiting pop-punk. Musically speaking, “I Keep Thinking…,” sees XCX quickly return to the realm of more understated, ’90s-adjacent club music. Lyrically, though, she’s very much swimming in the same rage-inducing deep end as she stokes listeners’ moods with lines like, “Now I’m wondering if I maybe could be gay/But come on, look at me, I’m probably not.” Get Charli XCX Tickets Here Similarly, the track features the line, “I’ve always wondered if you were actually gay/ Or if that’s somеthing you just say for your career.” Who precisely could XCX be talking about? Perhaps Taylor Swift ?…