There are a number of words that could be used as synonyms for the term "squabblers." One might use the term "bickering" to describe people who argue or fight in a petty or seemingly meaningless way. Similarly, "quarrelers" or "disputants" could be used to describe those who engage in verbal disagreements. Another term that might be used is "pettifoggers," which refers to people who argue or litigate for the sake of argument rather than seeking a resolution. Whatever word one chooses to use, the key idea is one of people who argue or engage in conflict in a way that is unproductive or even counter-productive.