Please don’t forget that Loki showed interest in David and Sigurd long before the Fandral panel popped up. Loki outright propositioned David. Loki flirted heavily with Sigurd (and in the altered timeline, Sigurd was clinging to Loki naked when they escaped from hell). Loki repeatedly called Billy Kaplan ‘pretty.’ Loki basically said that Teddy Altman was literally too perfect to exist.
Fandral is not “finally, confirmation of Loki’s bisexuality!” Fandral is “aaaaand Loki just made out with Asgard’s biggest playboy, huh? Had to happen sometime, I guess.”