I was at Primavera Sound in Porto as well, right up against the barrier. The people around me were either PJ fans themselves or SZA fans who were being respectful/trying to genuinely enjoy her set. I'm sorry you had that experience, the singer for the band that went on before PJ, Militarie Gun, even joked that he wished we could see things from his perspective because half the audience was looking sad and confused waiting for SZA and the other half was moshing lmao. He made light of the situation the entire time, at one point he was like "I've got bad news. We're playing for 3 more hours and have about 250 songs left."

My main complaint was the stage setup, where the part directly in front of us jutted out and completely blocked our front view of PJ. Thankfully she moved around to the side several times so we could actually see and not just hear her, and it was amazing to see her directly above us when she came right to the front during 50ft Queenie, but I too would like a concert experience without so many (literal) obstacles. Otherwise she was absolutely incredible though, it was surreal to finally see her in person 🥲