noun

a person who lavishes praise, often insincerely; a sycophant.

he is not allowing flatterers to deceive him

sycophant,groveller,fawner,lackey,obsequious person,kowtower,time server,crawler,creep,toady,bootlicker,yes man,lickspittle,doormat,truckler,brown-nose,suck-up,encomiast,toad-eater,arse-licker,arse-kisser,ass-kisser