People like you are the reason we lack healers in this community.
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I've not ran into any issues of people bothering me about DPSing.
With that said though, always use your best judgement when it comes to pugs. If dps is being stupid and standing in bad, and tank taking on massive damage from large pulls = Healing comes before dpsing.
If you got the freedom to dps, do so, if only to silence the little lambs like Crystal who like to abuse the vote kick system.