Afaik that’s actually illegal. You don’t brandish a firearm unless you’re ready to shoot someone. Additionally, I’d highly recommend looking more into the case. The short of it is that their “prank” was shoving a phone into his face that played, “hey dipshit, stop thinking about my twinkle” repeatedly. He told them to stop repeatedly and tried to push the phone away, but they continued to push it into his face.
Furthermore, keep in mind that the US is going fucking insane. We have public demonstrations by neo-nazis. The KKK’s membership is increasing and klansmen have been seen waving their membership cards at pride parades. Now, I don’t really know what was going through the shooter’s head, but personally? Personally I wouldn’t roll the dice and bet that someone who’s shoved a phone into my face saying, “stop thinking about my twinkle” and won’t back off when I tell them to isn’t about to murder me because they think I’m gay.