A bad take (n) is an opinion that is either uninformed or poorly reasoned. Typically used to label disagreement in a meta conversation about someone else's take / opinion.
Avi: What do you think about the NYT article analysis that says Facebook "mom groups" are a good source of information for a parenting noob?
Liz: That's a bad take! Those groups are filled with harsh brutal bitches who live to shame other moms.