Random flaming is no elitist in anyway. That is players trying to slap buzzwords on everything, so that the casual defense team in LFR will pounce on people being dicks. Say "kik the asshole" in LFR and it might pass. "Kick the elitist" and they will be gone
Your example of add damage is weak. Any damage you deal where other players logs detect it is counted. If you are pulling low numbers on Naz you are pulling low numbers. In a flex raid I will kick people under 100k on Naz if we are having issues, regardless of their add damage, because clearly they just are not doing much. I will also kick those with no add damage. Low dps is still an issue, you cannot follow mechanics but have low damage and expect success, it doesn't work that way.
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Pls blizzard add LFR coloring to flex so I can keep my sanity.