Akademik

too big for one's breeches
adjective
(used colloquially) overly conceited or arrogant
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"a snotty little scion of a degenerate family"-Laurent Le Sage

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they're snobs—stuck-up and uppity and persnickety

Syn:
bigheaded, ↑persnickety, ↑snooty, ↑snot-nosed, ↑snotty, ↑stuck-up, ↑uppish
Similar to: ↑proud
Derivationally related forms: ↑uppishness (for: ↑uppish), ↑snot (for: ↑snotty), ↑snoot (for: ↑snooty)

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phrasal also too big for one's pants or too big for one's boots
: exhibiting self-approval not justified by circumstances : above oneself

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see big

Useful english dictionary. 2012.