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Machinists that use Blank.
White Mages that use Fluid Aura.
Summoners that don't understand the basic concepts of pet micro (And that Ifrfit is flat out better in dungeons anyway, plus he's safe to leave on Sic. Seriously, Ifrit is a cool guy).

I have a macro for this, warning that the use of the above abilities will result in them becoming the new tank when on DRK (Rahal) or WAR (Reiko), but there are some people that just refuse to listen, kick the mob out from under me, then whine when I can't get aggro back on said mob in less than 1 GCD because I'm too busy dodging the AoE I could have just simply stunned. 

Machinists and WHMs tend to be worst for it. It seems WORSE at Lv60 because ERMERGERD MAH DEEPS MATTER IN TRIVIAL CONTENT LIKE ESXPUUURTS. I WANT TO PUT THIS ONE EXAMPLE OF A HIGH PARSE ON REDDIT GAAAAAAAIS!

Oh I might as well add:

Scholars that leave Selene on Sic when a silence is needed (Or Scholars that leave the pets on auto in general)
White Mages that spam Holy when a stun is needed.
<Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> <Blunt Arrow> <Just used it> <se.1> *Attack still goes off because of the above SCH*