Oil and water don't mix

Cultural  

1. Certain qualities or personalities are incompatible.

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Example Sentences

A planetary scientist at the University of California, Berkeley, now proposes an alternative theory -- that the interiors of both these planets are layered, and that the two layers, like oil and water, don't mix.

From Science Daily

It's accepted wisdom that oil and water don't mix.

From Salon

Drilling through bedrock and soils beneath the straits would violate numerous environmental protection laws, said David Holtz of Oil and Water Don’t Mix, an anti-Line 5 coalition.

From Seattle Times

In Michigan, Sean McBrearty, a coordinator for Oil and Water Don’t Mix, said the Enbridge pipeline is not needed to supply the region and that train cars or truckloads could replace it.

From Reuters

And, really, how exactly are we supposed to slather slippery concoctions on skin still wet from a shower when everyone knows that oil and water don’t mix?

From Seattle Times