I guess Mimi felt she needed a confidence boost but it could’ve backfired kissing him so soon.
That said I don’t think Josh was really hitting on Grace. She was shooting her shot, and he’s a confident flirty guy so yeah there was some flirty banter but it was quite reserved for his standards clearly.
Grace was definitely the one trying to make a move on him and she pulled him. Did you notice when she said “you’re beautiful” he just said thanks but - unless I missed it somehow - he didn’t say it back ? 😂