I was gonna say this. Plus, she’s grown up to be an annoying adult who likes to say stupid shit on The View. My favorite being how she discounts people with "ghetto names’ as if she doesn’t have a useless accent on her very own misspelled name.
She is quite insufferable but to be fair, I think she’s *supposed *to be so maybe the kid is just a very good actress. Or just a truly annoying little brat.
At least the kids on Everybody Loves Raymond were pretty quiet and stayed in the background, quietly amusing themselves. Unlike in real life!
Jay North as Dennis the Menace infuriated me - me, personally, back in the day when I actually watched it on tv with my grandma. I thought he was WAY too tall, not a cute little bundle of energy. He was a lousy actor even to my untrained 10 year old’s eyes, and he stood there woodenly spouting dialogue with his hands held stiffly at his side in a most unnatural way. No way did this tall wooden geek resemble the comic strip kid!
Now, my go-to answer for this kind of thing is generic: there’s always a ‘little sister’ or some other young relative - a niece, a cousin - sent to live with the heroine because the parents died tragically in a car crash. The ‘little sister’ spoils the heroine’s life by drinking, sneaking out at night, acting out in general, getting kidnapped by the villain, getting in the way of the heroine’s love life, and generally acting like she has a bucket stuck on her head. There have been many tv shows and movies, the best example was the 2007 short ‘Bionic Woman’ tv remake starring Michelle Ryan…Why is it always a female young relative, and why doesn’t the heroine send her to Auntie Em’s in Kansas to live, instead of getting in her way in a city loft?
Joffrey Baratheon
AJ Soprano
No mention of the Olsen twins? Seriously.
That annoying little bastard from Family Ties, Brian Bonsall, went on to play another annoying little brat, Alexander Roshenko, son of Worf, on Star Trek: The Next Generation.
I couldn’t stand Abel on Sons of Anarchy. He just seemed to lurk creepily everywhere.
Relatedly, I am annoyed by the trend of doing a “junior” version of everything. Project Runway Junior, Chopped Junior, Masterchef Junior, Kids vs Chef, (seems like a lot of cooking shows!) bleh.
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Wasn’t North, like, 27 when the show ended? 6-foot-2 and shaving? Voice like Doris Grau? All packed into those baggy overalls, sheesh! 
The girl robot on Small Wonder.
Dr Smith.
Damn you people are old. I was expecting more recent examples. 
My example might be the only one still currently in production (with Rusty being an adult).
Though “all of them” does cover current shows. 
Mary Ingalls on Little House. Self-righteous bitch. Over-acting Albert. Might as well throw in the useless Carrie(s), too.
Alex on Modern Family. An awful human being who gives off a bit if a serial killer vibe.
I was going to leave it at Alex, but this reminded me of another awful kid:
Dawn from Buffy.
The twin boys on Seventh Heaven. Not really that obnoxious, just the worst child “actors” I ever saw.
Except for Lucas Black on American Gothic.
Rusty on “Make Room for Daddy.”
Our Gang
Bowery Boys
East Side Kids