I have two possible explanations for May's behavior.
A. May is a plant by nefarious individuals out to scam Dale. Her snark and attitude are because she's been trapped into it and is doing it against her will. They trapped her consciousness in where ever "a ro-" is and have been using her. She is helpless to fight back, call for help, or even warn Dale because if she does, they just pull the plug, and she dies.
B. (the less dark and creepy version) May is doing a job. She has been hired to evaluate Dale by some outside agency or corporation for a high level job requiring a truely good person. May's initial "Master, I live to serve" bit was to get him to bite. Everything after she turned on the 'tude has been to provoke a negative reaction, to see how he reacts when he thinks no one is looking. (You are what you do when you're all alone in the dark, after all) If so, he's passed with flying colors so far.
I like this arc. Before, what we knew of Dale was that he was a slightly annoying dude who was also a bit creepy. This arc has revealed a fine upstanding dude who works multiple shit jobs, helps suppourt his mother, and refuses to be mean or petty when no one is looking when he could easily get away with it.
He comes of as a more mature and better person than Marigold. I know Marigold has been knocked around by life, has subteranian self esteem and reacts the way she does because of how she's been treated in the past, but the poor girl also seems to have a massive victim complex and is willfully refusing to grow up. I realize growth is painful, but there's living, and there's just existing. Marigold is mostly doing the latter.
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Ah whatever. Ima post it anyway. *dives back into the all concealing shadows*
EDIT; Maybe Hanner's mom or dad, having gotten wind of Dale's possible employment at CoD, sent an evaluator to check him out?