That Bad Eggs moment is one of the reasons why I prefer to attribute most of these things on Buffy's POV. ("It's not what really happened, it's just how Buffy remembers it.") Because otherwise Joyce's behavior doesn't make sense. She overreacts when it shouldn't be a big deal, but remains calm, when she should be freaked (like when Buffy mentions saving the world from vampires in "Bad Eggs". Given Buffy's previous mental issues Joyce must be terrified). The only other possible explanation why Joyce's reactions are so bizzare is brain tumor, that affects all her actions during the whole series, from season 1 until death.
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Because otherwise Joyce's behavior doesn't make sense. She overreacts when it shouldn't be a big deal, but remains calm, when she should be freaked (like when Buffy mentions saving the world from vampires in "Bad Eggs". Given Buffy's previous mental issues Joyce must be terrified).
The only other possible explanation why Joyce's reactions are so bizzare is brain tumor, that affects all her actions during the whole series, from season 1 until death.