I think the argument has too much nuance to be put to bed.
Most people seem to agree that sectarian abuse is unacceptable.
Most people seem to agree that McLean isn’t the best face for it.
But I think the nuance comes from the fact that there are those who dislike him as a personality and those that use that as an excuse to mask discriminatory beliefs.
Yes, he is the wrong face, yes, he puts his foot in his mouth, and no, he isn’t eloquent, but none of that gives anyone the excuse to jeer or berate him for his position, beliefs, or nationality.
That’s the crux of it.