I’ve been told that toddlers lack the brain function to regulate emotions effectively, so they will go into a spiral of emotion about *anything*.
Just ignore it as long as they aren’t hurting themselves. Don;t even make eye contact. Once the emotions have subsided (can take a while), reengage. Research has apparently shown that the cause of the tantrum is of pretty much zero importance to them once the tantrum is over. As the pre-frontal cortex develops, they will be able to deal with it. Most importantly, don’t take it personally or reward the behaviour.
Interestingly, when they hit puberty, that part of the brain will once again struggle with regulating emotions, hence the whole moody teenager thing.
It’s easier to deal with it once you understand it’s mostly chemical.