I see the adjective tag, but for me "a single word for someone" calls for a noun (otherwise you have adjective + "person"). So, my suggestions are:
adulator
That many in the eighteenth century actively resisted what seemed to them classical cultural imperialism, something supported by contemporaries they considered spineless adulators and imitators, may be less widely understood.
No one likes a smarmy adulator
derived from
to adulate
Praise (someone) excessively (ODO)
or you could use:
flatterer
A person who lavishes praise, often insincerely; a sycophant:
he is not allowing flatterers to deceive him
If you insist on an adjective then the above mentioned:
smarmy:
behaving in a way that seems polite, kind, or pleasing but is not genuine or believable (M-W)
might fit.