Got kicked from lfr for low heals

AGAIN for the 50th time
it was trash and the slams in the maw were going off and they blamed healers for not being able to heal 10+ stacks of slam

if everyone has 15k hp on avg

and slam is hitting everyone for 6k there 2 different mobs slamming the raid
and tank is pulling stuff on the ramp which also throwing out random aoes
how in anyway is it the healers fault for not being able to keep anyone alive from ticking 12k damage every seconds i got a headache at this point but i think i see the issue why LFR is the way it is

critical thinking seems to be a general skill lacking for the avg wow player nd quite frankly i give up and dont care anymore