Nice blog (now bookmarked), good advice!
I fall into some of these traps on occasion: #2, #3, #4 #6, #12 and #16 all come to mind.
One that I find particularly grating is #9 and its variants -- i.e. someone posts a snarky, combative or dismissive comment and then adds a chirpy "Metta' or
under it, just to twist the knife another turn... Unfortunately I have probably done this too..