This whole 'he obciously did something to deserve it' is a crock of crap. I know people who have had there cars totaled by certain fluids thrown on them or them being run over by low life dicks with nothing better to do. They didnt do anything to upset anyone, there are just some small minded people about.
Oh and I wouldnt worry to much. If there doing it by text then obviously havnt got the balls to do anything to your face
If they were going to hurt you physically then they would be in your face etc, not by the phone. It is more than likely some sad chav who got this poor fellas number
Anyway I am talking on so off to bed I go LOL