But between us, who's the worst MC? You!

[Glizdka]

This comes from Epic Rap Battles of History on YouTube.

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Robert to Thanos: "You might be something in the MCU, but between us, who's the worst MC? You!"

The MCU - The Marvel Cinematic Universe (where Thanos appears).
MC - A rapper.

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I'm not sure if I understand the "between us" part.

Is that making a comparison between Robert and Thanos, or is it somewhat equivalent to "to be honest with you"?

If it's the former, why worst and not worse?

 

[probus]

I think Robert wants to take the edge off his insult just a little. So he says "between us" to let Thanos know he's not going to share his low opinion of Thanos with the world at large.

 

[Glizdka]

I think Robert wants to take the edge off his insult just a little. So he says "between us" to let Thanos know he's not going to share his low opinion of Thanos with the world at large.

That's a possibility I didn't consider. Makes perfect sense, thank you!