> One thing I learned was that most short words are negative or at least excessively blunt.
There's an interesting reason for that.
Although English contains elements from numerous languages, it's two primary ancestors are French and the Germanic Anglo-Saxon.
In the middle ages, most of the English peasantry spoke Anglo-Saxon. The nobility, however, all spoke French for several hundred years after William the Conquerer invaded in 1066.
To this day, that ancient split in languages is still obvious. Everyday words in English, including words for animals, household words and swear words, tend to be Germanic: short, guttural and abrupt.
Words to do with civic society, culture and the ruling class are usually from French. They are usually longer and sound more refined. Examples: parliament, judiciary, government, etc.