He's a scab to you, but not to anyone not boycotting because of King. It's the right word whatever you think. People are breaking a boycott/strike.
So to answer your question, yes. Who is a scab depends on the position of the person calling the names.
Throwing out moral judgements is a dangerous game, it always lends people open to having to look in the mirror.
And that's a dangerous place to look for many of us.
It's also entirely the wrong word too. Many of the people not going are just not going because the club's been taken away to a place it shouldn't be. It's not a concerted 'campaign' for most, more the removal of practicality.
The fundamentalist minority however, who spend their time spouting the same old same old must surely be the ultimate SISU plants in all this hopwever.
Because who else than people attempting to divide and rule would attempt to divide? Be it non attendance at Sixfields because of NOPM, non attendance because of prqacticality, attendance under duress, or attendance because you believe absolutely this is the way to a long term future and wish to support it... or attendance because your pet gerbil really loves the beefburgers, we are all united in one thing.
Like it or not, we're fans of the same fucking club.
So why the constant desire of a vocal minority to impose their own morals on that, and split some into non-fans?
It goes beyond 'banter' and heads towards cuntishness.