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I think some people read reports of nausea and such then instantly assume the change is affecting them the same way, whereas if they don't recognize the change, they don't notice any difference to the way they feel. That said, there is a very legitimate beef with LEDs that aren't running off of smooth bridge rectifiers. If they are only running on the half cycle, they will flicker very noticeably and create visual artifacts when moving. Fully rectified supplies don't really produce a consciously noticeable flicker, but it still plays with the senses of some people in a negative way. Only a smoothed DC supply can provide a fully flicker free experience - and that is often the big difference between cheap LEDs and more expensive ones.
I have little doubt that the fridges that instantly nauseate some people are due to manufacturers cutting corners on the lighting power supplies.
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