tall poppy syndrome 
noun [mass noun] informal, chiefly Australian /NZ
A perceived tendency to discredit or disparage those who have achieved notable wealth or prominence in public life.Australia's tall poppy syndrome refers to a tendency for Australians to downplay achievement to the extent of being disdainful of such people, and so to cut them down to size....
- And I think it's condescending of personalities like Nikki Webster to say that the only reason people don't like them is because of tall poppy syndrome.
- Maybe she's a bit too confident, and it's tall poppy syndrome.
Origin
1980s: see tall poppy.
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