Learn Italian: Nessuno può sopportare quel ragazzaccio.

The suffix -accio is pejorative, meaning it adds a negative, derogatory, or "nasty" quality to the noun. By dropping the final -o of ragazzo (boy) and adding -accio, it changes the meaning from simply "boy" to "bad boy," "brat," or "thug."

Is sopportare a false friend? It looks like "to support."

Yes, it is a classic false friend! Sopportare means "to tolerate," "to stand," or "to bear," which fits perfectly with not liking a "bad boy." If you want to say "to support" (like helping a friend or backing a team), you would use a verb like sostenere or tifare per.

Why is there no non in this sentence if it's a negative statement?

In Italian, when a negative pronoun like nessuno (nobody/no one) comes before the verb, you do not use non. You only use the double negative if nessuno comes after the verb. Since nessuno is the first word here, it does the negative job all by itself.

Why do we use quel instead of quello here?