Someone can 'overreact when driving' and flip the car on a turn. I regularly over react when playing video games and miss a jump. Companies over react to data and make bad choices.
So not just in a 'clinical definition'. I've given you plenty of examples of over reacting being non-emotional. Even your definition, the one you quote, says that over reactions can be non emotional. An over reaction can be, by the very definition of the word, a reasonable miscalculation of risk/reward without having to imply emotion.
> This would be an emotional reaction to me defining the term overreaction correctly.
Actually, it's quite reasonable that if someone says demonstrably false statements, the next thing they say is put into question. If you choose to see this reasoning as inherently emotional, that's your prerogative, but it seems quite baseless.
The dictionary definition of overreaction is "a more emotional or forcible response than is justified". You're attempting to use the clinical definition of an overreaction in place of someone personally overreacting, which is incorrect. He didn't take down his blog as a result of his immune system overreacting, he had an emotional reaction which made him take down his blog. From a rationalist standpoint you're wrong.
> Otherwise, your lack of accuracy in previous statements makes me dubious about your argument.
This would be an emotional reaction to me defining the term overreaction correctly.