Pissing Contests and Pissing Off Everyone
The modus operandi of Microsofters isn't hard to figure out. When it comes to the Free software community, they try to divide, to seed/sow discord. They'd piss of the left, the right, the BSDs, the Free software "Sticklers" (or "Purists") without failing to "sting" also the "Ordinary User".
See, at the moment most people still use Android or Windows (sometimes both). Microsofters see Microsoft collapsing. They don't wish to risk any more people showing interest in Free software, so they project an environment that's hostile and alienating to everyone (like "STFU, n00b!" if you're new and "you're an elitist" if you're a veteran). Microsoft is a "no show" in mobile, so it must accept coexistence with Android, but the last thing is wants is a mass migration to LibreOffice, ODF, GNU/Linux and so on.
If people who came from Microsoft are trying to vex and divide the community, then consider that an expected and predictable tactic. It is, after all, in Microsoft's very own Halloween Documents. █