Well, mine's somewhat opposite of what happened to you guys.
During the early days of jamming, my band used to jam at Boons. And one fine day, some metal heads came in and said "Eh hi, can my friend jam with you guys?" so we were like uhh ok? At that time, i was the only guitarist in the band so the other amp was available and my band played Blink182's stuff. And on that day, we decided to jam Dammit which is one of Blink's easiest songs. So we showed him the tabs and all and told him the tempo but when we started playing, he was like playing clean out of a Roland Jazz Chorus off beat and 'headbanging' for 2 seconds before pausing to look at the tabs again and carry on 'headbanging' for another 2 seconds.
So apparently, he's some loser from St Andews (I asked my brother who studied there at that time) and he followed his metalhead friends to jam but couldn't play or something like that. Could like tell that they treated him as a joke. But he kinda was one anyway.