Correct. To be fair, I'm not going to claim it was entirely good-natured from the couple of 'Well fans - there were a few wanker signs and middle fingers, and can't say for certain whether there was any real malice in it. However, there were plainly no monkey chants.
Either it was good-natured banter between Blackman and a few 'Well fans (it was only him involved contrary to that nonsense article), or a few 'Well fans tried to abuse him and he reacted like most footballers do by laughing at them.
The story, however, is fiction. I'm not suggesting a Celtic fan rushed home in order to deliberately lie about Motherwell fans, I simply think he/she has seen a few 'Well fans interacting with a Celtic player who just happens to be black and have jumped immediately to the conclusion that it was racist abuse (perhaps throwing in made-up monkey chants for that sensationalist feel). That says far, far more about Celtic fans than it does about Motherwell fans.
Offended by everything, ashamed of nothing.