I've heard many theories on the LoK hatred. (Personal favorite is because they don't like how they saw themselves in Korra more than they ever could in Aang.) The one you point out is a massive complaint for one reason, really: traditional sci-fi standards.

Let me explain. When it comes to fantasy in general, you have one crappy unofficial rule: you either downplay the magic to get the better tech, or you downplay the tech to do more with magic. This can be seen in all medieval fantasy stories as well as most sci-fi space stories that have mystical elements. There are even examples of this in modern fantasies, like Riordan's "monsters are attracted to half-bloods using cell phones" and the Harry Potter's Department on the Misuse of Muggle Artifacts. The most successful rule-breaker to this norm is Star Wars (even with the midichlorians), and there are a lot of smaller ones I know of as well.

That being said, ATLA has it's tech kinda at an American Civil War time period, or roughly about the 1860s. Therefore, the 1920s feel in LoK isn't too far off in the world itself, and I felt it was incredibly well done.

If you don’t like something you don’t have to, but some of the arguments people come up with to hate it are just ugggghhhh

Ikk. people were saying on a video announcing that the original creators had left the Netflix adaption that 'maybe it's a good thing, they made LoK after all'

I just get irritated that avid LoK haters have to hate on literally everything that comes from LoK. On a poll for which avatar's animal companion was our favorites, I saw a comment saying "Eww someone voted for Naga." Didn't even elaborate, just left a whiny "eww" because they don't like Naga because she comes from LoK. And then on a 'who would win' poll between Jet and Asami someone else insulted everybody who voted Asami. But anyway I see where you come from. There are places where it's okay to talk about why you don't like LoK but some people just go to every thread and bash LoK which gets annoying.

Yeah. like how hard is it to provide a reason instead of just constantly bashing it.

Some reasons are bad to tho, like korra is so stubborn, but then they also like toph

Yes, it's annoying when people constantly hate on LoK, for no reason at all or for a reason that doesn't make sense. An opinion is an opinion but it's so annoying when some people have to say "I hate LoK" on every post that mentions LoK. LoK isn't even bad, in my opinion, it's a good show just like avatar. I don't get why people have to constantly hate on LoK.

They hate on it because it isn't quite as good as ATLA I think, but nothing is as good as atla

True