Recall that Addy has repeatedly demonstrated irrational/insane ideas of acceptable behavior and responses to unacceptable stuff. Addy complaining that someone is incompetent and/or evil just has ZERO weight to it.From an outside perspective, it's entirely possible that Addy hates them for not having enough cookie vending machines, there being tinker regulations at all, or pre-emptive response to a punishment they're going to assign a year from now. That she thinks they're incompetent because they don't systematically murder villains on the sly. Or haven't already destroyed Nilbog. Or didn't do <insert atrocity here> already.
Remember, Taylor is aware or damn well should be that Addy killed multiple people with her tentacle-cat (due to the Splyce thing), and considered it adorable, and put a lot of effort into destroying Glory Girl's reputation because she attacked the cat. And is very familiar with her attitude toward Armsmaster, among others.
Her first introduction to Addy's tinker-tech included an invention whose side-effects included permanent 'hallucinations, paranoia, delusions' if used for more than half a minute, a tupperware land mine, and Abby setting the kitchen chair on fire.
She's aware that Addy seriously intended to repeatedly torture people to death and thought them surviving that would make it acceptable to Taylor's mom. She's seen a lot of examples of Addy being blatantly wrong in her understanding how other people think and react-- particularly blatant with using arguments/reasoning to try to persuade Taylor/Annette/etc and comes off as horrifying.
