Your write-up nails what a misfire Angry Boys is from the start Natalia and it only gets more lacklustre in the second episode with the introduction of a severely undercooked and wildly broad parody of an American rapper. It's a character which is completely at odds with the downbeat vibe established in the pilot and makes the whole shebang frustratingly uneven in tone.
It bummed me out because I liked Summer Heights High a lot and became a fan of Lilley, but within two eps of Angry Boys it felt like the significant improvement he'd made from We Can Be Heroes to SHH had washed away and Angry Boys just ended up making me sad.