Someone who likes to pass off the accomplishments/goals of others as overlysimple or easily attainable despite being an unintelligent blowhard.
Steve: Did you hear? Nick got a job at that Fortune Five Hundred accounting firm.
John: Pfft, whatever. Nick ain't even smart, just got lucky. Besides, I could do that shit any day.
Steve: Dude, are you serious? You can't even spell 'because', you're living with your mom and trying to become a rapper. Bro you're a serial trivializer.