Advice

Rita confessing to Eevee Without her zoomer slang would probably make him question if her feelings are genuine. He knows she expressed her emotions through her creative wording and has a good grasp at what they mean, so her saying "You're the real frizz and our vibes match, so I want to keep skibidi with you frfr" would land better than any "I love you" she'd try to say.

Thing is Eevee wouldn't stay around you, Rita, if he wasn't cool with the slang on some level and didn't find it a joyful addition to his life.