Some complainers, in modern lingo Crossword Clue

 The crossword clue "some complainers, in modern lingo" could refer to whiners. A whiner is someone who complains a lot, especially about unimportant things. They are often seen as negative and annoying.

Here are some other words that mean the same as whiner:

Complainer

Griper

Nörgler

Grouch

Curmudgeon

Sourpuss

Grumbler

Moaner

Grouser

Kvetch

I hope this helps!