But yeah as far as your raid leader is concerned, your best option would be to look for a new, Tankadin friendly guild. Maybe see if your mates will come with you aswell?
Failing that, you could point out that:
Paladins are possibly best MT class vs:
Leo
Tidewalker (Although better used vs murlocs)
VR (Assuming high spelldmg and/or ret pally)
Invaluable OTs vs:
Solarian
Tidewalker
Hydross
Fathomlord (Hunter)
Alar (Adds)
And can "do" the others (Either as OT or MT) just as well as most warrior / druid tanks, but is really just a question of gear/skill for the others
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