Yeah, I don't think it was meant to make Christians look bad at all. It just made fun of that one nutty woman who happened to call herself Christian. I'm sure many of the people who are laughing at her are Christians themselves.
Although she seems like she is mentally ill so maybe it is cruel to be laughing at her.
That's true, but they're what most 'normal' Christians would call misguided I think, and most likely feel slightly embarrassed for them. Anyone else, unless they're also 'misguided', would simply call them nutjobs.