Almost certainly not.
If you've spent much time in "Blighty" recently you'd know that motiveless abuse and vandalism are now rites of passage for a good percentage of British youth. It's a true sickness.
It's not uncommon for firefighters responding to calls, for instance, to come under attack by gangs of rock throwing youths who verbally and physically abuse them. That's right, firefighters. Throwing rocks at buses, trains and cars on freeways are everyday occurrences. Basically, anyone peaceably going about their business and who appears as an easy target can become a victim of the youthful lust for mayhem and "bovver". The same mentality fuels the British soccer hooligan.
An elderly man and his son having fun would irritate the hell out of these barbarians. Firstly, they'd appear to be "soft"; a true crime in the eyes of these thugs. Secondly as a family unit, they would embody wholesomeness, another crime.
This was done by young Caucasian males, almost certainly.
Did you forget your sarcasm tag?
Man. That’s scary. How Britain has fallen. Thanks for the info.