People who are talking about kicking healers are talking about healers who are literally idle, jumping or /dancing or /follow on tank. Healers like this:
http://i.imgur.com/t2h4Cav.png
It's hard to say anything about which jobs people play based on their forum accounts, but I can say I've been a healer main in this game in 1.0.
This has been said a billion times, but
no one is asking healers to DPS to cover for DDs. People are asking healers to DPS because otherwise (apart from specific situations, of course) healers are being much less active than their party members, and that's not fair.