@bagpuss90 What a cheeky bastard!
I would totally block him. Message him first though and say 'I am disgusted at your attitude, and never want to speak to you again. NEVER contact me again.'
And then BLOCK him - on everything you have him on. Mobile phone, twitter, facebook, instagram, Linkedin etc...
What an arsehole! 
This does actually put me in mind of a couple I used to know who used to run a photographic studio.. From the mid 1960s actually... waaaaay before digital photography, and being able to produce decent photos yourself.
They had a photographic studio from the age of 23 to the age of 63. (1966 to 2006.) They decided, after 40 years of hard work, that they would retire at the age of 63.
Another woman I sort of knew from the local pub me and DH frequented in the town I used to live, asked them - in summer 2006 - to do some portraits of her 2 'precious boys' aged 5 and 7.
The photographic studio woman said 'sorry we aren't taking any more bookings as we are retiring in a few weeks.'
The woman with the 2 boys went BATSHIT. Said they were letting her down, and where the fuck was she meant to go now, and slagged them off to anyone who would listen. (facebook and twitter weren't a thing then, thankfully, or she would have berated them on there too.)
Like you though, they were retiring, so anything this woman said, had no effect, because they weren't taking on any more work anyway.