These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The community itself seems to treat making fake VHS openings and watching "baby shows" as some sort of unforgivable sin.
Most Annoying Sound: Try to make characters scream by typing "aaaaaaaaaaah" and it gets something weird. The use of the "Wise guy" voice for yelling is also very easy to become highly annoying. Or when people make a character repeat a noise for a little too long.
Whenever someone re-uses the "sewage" noise over and over and over.
ANYONE who uses the alarm sound effect(s) very loudly.
Kidaroo's voice. That is all. Especially if the author using the voice cranks its volume to unforgivable levels.
Narm Charm: Some find the low-budget text-to-speech voices quite funny:
"No no no no no no no no no no no no no no no no no no no no no no no no no no" becomes this and Overly Long Gag rather quickly.
"I feel sick - and when I feel sick my voice changes to ____."
Whenever someone tries to make the characters say "Ew", they may instead say "E Double You".
Whenever someone types a large amount of consonants, which may lead to someone say "Double You Double You Double You Double You Tee Tee Tee Tee Tee Enn Enn Enn Enn Enn..."
Even if you use vowels. "Double You Double You Double You Double You Double Double You Double Double You A A A A A A A A A A A A H H H H H H H H H H H H H H H H H."
The text to speech voices may also be this way - whenever someone is supposed to be angry or sad, they sound exactly the same as when they are happy or neutral.
Periphery Demographic: There are two of them! The website is intended for businesses to easily make animations for their company, but the website is more often used by little kids who just want to make their own cartoons...most of said cartoons are about people getting grounded or behavior cards, or poorly-made remakes of HBO/Noggin/Disney Channel sign-off bumpers. Then said cartoons gained their own periphery demographic of older people who find them funny for all the wrong reasons
Then it comes around again, as some of the older ironic GoAnimate fans start making their own GoAnimate videos, and get subscribers and fans from the actual GoAnimate community who don't realize they're being made fun of.
So Bad, It's Good/Snark Bait: The limited animation and bizarre subject matter have attracted a rather devoted following who love to watch the videos completely ironically.