IMHO, a reasonable TLDR of this particular memo would be:

Yes, there are some socially awkward/non-standard pilots out there who should be doing better. Try not to be that pilot.

However, when you're with one:

Have you considered using these tools (lists six specific strategies) first instead of calling off in the middle of a trip?

This memo was directed primarily at the pilots calling off, secondarily at the problem children.

Pro Standards is a useful organization that attempts to mitigate potential problems arising over personality clashes, non-standard flying "techniques", etc. before they rise the level of formal disciplinary actions by management. But collectively, the pilot group needs to give them a chance first.