cynic
gloomster
negaholic
Eeyore
negativer
naysayer
negativist
negative Nancy
indifferent
gloomy
teeter
gloomy Gus
nay-say
poorly
unpleasant person
disagreeable person
despisal
negativeness
despising
negativity
distruster
scorn
negaholism
negatism
lukewarmist
negativize
sinner
antioptimist
Eeyorish
wear something as a badge of honor
Debbie Downer
bitch
nonaccepter
disgust
abhorrence
cunt
antiskeptic
go over like a lead zeppelin
disparage
belittle
go down like a lead zeppelin
on opposite sides of the barricades
pick at
go down like a lead balloon
social justice warrior
take a dim view of
doomist
pessimist
miseryguts
down