kids do stupid stuff. They most likely either have problems going on themselves or there jealous. I have a similar thing whenever i go up to my local pharmacy which happens to be near to where i do my work expereince there's always these students (From my old secondary or just starting college) that always are stupid and annoying to me and threating to take my bike, throw water over me etc... (Every time i've tried recording on my phone, my phone plays up or the battery dies)
Not to mention i remmeber once being in town and there were a group of school aged kids cycling in a dangeorus way doing wheelies in the middle of the road and bus lanes etc... I've even seen kids doing the same thing on motorbikes.
Kids do stupid stuff so they need to humbled asap. Adults also do stupid stuff and they should be treated appropriately. Kids putting themselves in danger is bad enough but when they put other people in danger, I'm all for showing them up for the idiots they are.
Wrt your phone playing up, see my thread on how new technology is rubbish yet still sells well. It sucks.
The most impressive wheelie I saw was me riding along and this kid zooms past doing a wheelie for the longest time, this guy was clocking it. The stretch of road he done it on was clear of traffic at the time.