It isn't even the "slightest disagreement". I have a problem with her because she has a history of making questionable statements and she isn't a socialist (if she is, she definately puts in effort to conceal that fact). I'd say the left has solidarity and it's growing every day. Only people like Johnstone, who hold ignorant views, see the left as being alienated from each other. I expect a "Why I left the left" essay from her any day now.