Oh, I dunno. Major freeways are generally well-paved and easy to drive on at 70-80mph, pipes reliably deliver water which is usually safe to drink in most areas, blackouts/brownouts are very uncommon outside of extreme weather events, and there's been a lot of visible investment in stuff like solar/wind power recently. We even have reasonably-maintained primitive road networks running through most of the nation's forests and wilderness areas.

Sure there are some dim spots, like the huge number of bridges that badly need renovation and the frequent need to replace old lead pipes, but it's fairly uncommon to notice the infrastructure in most states. And that's pretty high praise for infrastructure.

IMO there are plenty of good arguments that our social institutions are in a worse state than most other nations, but our physical infrastructure doesn't seem to be going to ruin just yet.

Yes I have, provide some substance to what infrastructure you mean, and what "less developed world" means.

As it stands, these statements are vacuous. Context helps. And to be honest, it seems like people making these statements haven't ever been to the "less developed world". America isn't perfect, but if you're going to just blanket write stuff like this, at least be prepared to back it up with examples.