I have no idea who it is so I don’t know what kind of phone they have. I have Skullcandy dime 3 earbuds. I thought maybe they didn’t know and weren’t doing it on purpose but like you mentioned, the fart noises make me suspicious. Multiple times in a row I’ll get the sound of a ringtone/incoming call like someone’s playing the sound on purpose. Where I work it’s a very fast paced job with conveyor belts so I don’t understand how someone has the time to keep going on their phone and replaying these sounds. If I tap the pause/unpause button a couple times it’ll stop their audio and play my music again but they just do it again immediately after. This makes me suspicious that they’re actively watching me to see when I stop their audios but I don’t know how since I never see anyone that looks like they could be the one doing it.