Back in the day, footballers would come into contact with fans more often in pubs, clubs, shops etc. and must have got some grief at times, especially from Fword fans who recognised them. They'd have to be professional in dealing with it. One example of somebody not being professional in those circumstances would be Rachid Harkouk in McDonalds 1986.

JOB should have ignored it or replied with something like "You're entitled to your opinion, wasn't my best game but 2-2 is not a bad result against a v good side". Maybe they've had previous exchanges, but if not then I'd say that was an unprofessional response from him and I think it reflects poorly on the club if they haven't schooled the players into how they expect them to deal with fans on Social media.