Have you ever had those raids where your fire team just doesn't work to you. Either if they just suck, or one of them dropped the n word. You just start thinking HOW can I leave politely or what can I say that is really random and stupid and will confuse them to make my escape? I've gone between saying I've played too much destiny and my eyes hurt or my hamster just got the news that he's been accepted to university, depending on the group.
EDIT: if you want Leave your best leaving lines, serious or not.
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I'm honest about it. I had a team this morning that was just beyond awful. On hard mode vog they couldn't get past confluxes. Full team of 34s. After 3 attempts I asked if anyone had done the raid before. Most of them had never even tried normal. I just suggested that they weren't ready for it. They agreed with me. I never raged quit on them. I just explained that the vog was mechanically difficult and their level didn't matter. They needed better weapons and to master the encounters on normal before trying hard.