If this person doesn't want her ex to have joint custody why can't she just argue for that? why does she have to stick her big ol' nose into other people's parenting?

Yup.
The lengths and depths that some folk will go to get back at an ex never fail to amaze and horrify me.

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please click and help the eggs hatch!

"The only abnormality is the incapacity to love"
-Anias Nin

And it never fails to amaze and horrify me what lengths people like Thane will go to in an attempt to bash gay people. Twisting a simple custody fight into a condemnation of all gay people adopting is pretty disgusting.

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The apocalypse is coming... we're gonna need more ammo.