corals are sensitive to rapid and wide changes in water parameters whether it be temperature, pH, alkalinity. Due to the how large the volume of water that is in the ocean these parameters really don't fluctuate as much as you would think besides temperature. pH only dictates how fast coral can grow but corals are much more sensitive to changes in temperature and alkalinity.
There is high chance that most of those in these groups don't even believe in most of the stuff they say. To them its just entertainment. People participate only because its a throwaway identity that is noncommittal. These groups have no leadership or loyalty. I'm sure this is understood a majority of the time by participants. The problem is that one individual who memes way too hard or is absolutely serious about the things they say. Real life friends call you out on your bullshit, they try to reason with you when you are irrational. they stop you from driving when you're drunk. Your internet troll squad does everything opposite.