
Whelp, found the rest. (Starts right after the ‘well then’)
https://myreadingmanga.info/kuranosukee-kase-ideal-body-boku-no-hero-academia-dj-eng/2/

That kid’s smarter than the 2 adults in children’s bodies. They might as well not of been reincarnated since their common sense and critical thinking is non existent. Why were they making comebacks at people who could snap their arms? Doesn’t making them mad put the twins at a disadvantage?

If i were in their place I'd say the same thing, berate them all I can, even if I was going to die and I had no hope. They are constantly being looked down on because they are 'illegitimate' or whatever, so it's understandable if they're getting annoyed that the only reason they were kidnapped was because they are the illegitimate children. I'd get pissed.
and them being adults, reincarnated has nothing to do with this. We don't know what kind of people they were when they were reincarnated, their personality types, their past. We know nothing besides what the author gave us, so this may very well be their previous personalities. Of course, modified to better fit their survival in their new life. Just because you don't like the personalities of their characteristics doesn't mean you can just blame it on the fact that they were 2 previous adults. We don't know nothing about those adults.

Lol i love the twins tbh but...ur right there not tht smart...but i mean they do have the brain of a like..how old r they 5...their body has the brain of a 5 year old....not a teenager...their conciousness is a teenager but their brain is a kid...the braina actually has more control then the conciousness....lol im studying physcology soo..yeah

Im glad you're able to deal with it and hope you're in a better place but this has nothing to do with them.
They've basically been hostages and abused for 5 years and are now introduced to a new reality. They're literally just finding out about the world. They went from teenagers to a kid with a mix of kid brain and a teenagers conciusnes (idk how to spell) and were abused from birth in the new world. It's frustrating but realistic

No I know it’s just kind of irritating I’ve met a lot of people the same problem but it’s kind of annoying when I need a person that’s not willing to try y’all willing to find a way to make things better for them selves it’s rare to meet somebody that’s not when you’ve gone through so much crap it’s kind of annoying That’s all understand the people cope in different ways but the unwillingness to try even though you can still be skeptical of the situation you’re in it’s really really makes me so irritated
Sora and Katerina have the same level of enthusiasm. Like it looks like they’re both straight forward and bounce off each other which kinda make me want to ship them a bit more... but nope! Be banished to the back of the harem sir!!!