Does a properly setup/functioning electric guitar have noticeably more
fret buzz than an acoustic?
I'm not really a guitarist, guitar tech or luthier, so I can't answer your question directly and authoritatively. However, I see that @DavidBowling in comments says that electrics theoretically should not have more fret buzz.
What I do know is this, as a bass player: Fret buzz (and other assorted noises, rattles and acoustic/dynamic annoyances) on electrics is much less troublesome than it is on acoustics. The reason is that in many cases the pickups on an electric will not pick up the fret buzz, or the signal from the fret buzz is so weak relative to the signal from the strings that it becomes virtually inaudible by the time the audio signal reaches your speaker, and certainly your ears or those of your audience when at a distance, surrounded by all sorts of sonic noise.
It happens often enough that I'll hear some annoying fret buzz or rattling on a bass when playing it unplugged, but through the amp that fret buzz is inaudible, so I don't worry about it if I'm pleased with my set-up, even though there's a bit of fret buzz.
Any fret buzz that might come through on an electric can also be eliminated or greatly minimized by adjusting the pickup controls or EQ through your amp, pedals, etc.
That being so, whether or not it's true that there tends to be more fret buzz on electrics, what fret buzz you might encounter is not as much of problem as it might be on an acoustic.
That also means that perhaps electric guitar makers, particularly in cheaper models, will produce instruments that are more prone to fret buzz than comparable acoustics, because fret buzz is less of a concern on electrics.