I really don't give a shit about them saying fuck on Star Trek. My issue was how awkward the scene was filmed, Tilly says "this is really fucking cool" or whatever the line was and everyone just stops and stares at her for a moment, which mainly served to emphasize that this is the franchise's first F-bomb. "Hey guys, our first F-bomb in fifty years. Bask in it."
That's not how the scene played to me. That's Tilly's exuberance getting the better of her, as it so often does, and then Stamets cutting her some slack. It was a nice character moment.