I truly just think June's zoned out. I don't think she's deliberately ignoring the radio HOWEVER she did admit to taking the earpiece out. 

I'm thinking the radio traffic affects her already foggy mind so she tends to pull the earpiece out in order to focus on what she's doing. Considering how zonked she seems to be most of the time I can totally believe that the constant chatter noise from the radio overwhelms her.

When I used to work for retail and had to have a headset on it was sooooo grueling to hear the stockroom, the fitting room requests, the cashiers calling for managers, the floor salespeople asking for sizes, security checking in.... uggghhhhhh.  When you learn to tune it out, that's another issue cause then you may miss stuff since you're trying not to pay attention to the radio anymore so you can ignore the noise.

She seems like a space cadet so I'm not surprised the radio is becoming a challenge for her. It is however a very serious safety issue and I hope she gets it together in that regard. Other than that she seems like someone who's gotten grief for being a couple of steps behind. You can tell by the way she doesn't want to admit to messing up and the way she's stressed about what Hannah "thinks" of her. I think it's kind of sad that she's automatically associating making mistakes (which I'm guessing happens to her frequently in life due to her "zen" like ways LOL) with being seen as a bad person. Hannah doesn't help with her barely hidden disdain for her. I don't think June has been mean or rude, just defensive and insecure and a bit wishful for some slack since she knows she lacking. 

Being a certain age doesn't automatically give you the capabilities of a well rounded, experienced worker. Hell, I've been working since I was 15 years old and working in the Corporate world since I was 17 and I was still making similar bad judgement calls well into my twenties when dealing with supervisors. It wasn't til 4 office jobs later and being in my late 20's that I was finally comfortable with just saying Yup, I messed up, I misunderstood, or I did something in error, or I didn't understand your instruction but pretended to and got it wrong....

Then I graduated to taking charge in how I receive instruction, convinced myself it was okay to slow down a conversation with a supervisor, repeat myself and ask simple questions (no matter how many) so that I could walk away with all the information I needed to accomplish a task. I came across MANY people (even outside of work situations) that got annoyed with having to explain themselves and didn't bother to hide their frustrations when I didn't magically understand what they mean from a 3 word sentence. Still do actually and it still takes extra energy to steel myself for their snideness. No fun at all. Not to mention exhausting. (I truly despise these type of people). Don't tell me what I should already know as a given just because you don't want to take an extra 30 seconds to explain something to me. Too bad if my slow processing skills annoy you at least I'm not doing it on purpose or doing it to be mean whereas people who don't have patience for people with no "common sense" have the right to be rude assholes cause they can't control their own meanspiritedness and their time is more important that someone else understanding whatever message they're trying to get across.  Granted in a fast paced environment this wouldn't jive well and I get that but ummm reality TV. She's obviously there for drama. They always have someone who is lacking in order to aggravate the situation. so I mean, poor girl doesn't need to be crucified. She fulfilling her purpose on the show. LOL

Point of the story not everyone flips a switch and has the "common sense" that everyone swears just washes over you at some specific point in time. Common sense is actually experience and not some freak phenomenon that attaches to us when we turn 16, 18, 21, 24, 28. It comes with trial and error, experiencing certain life situations and learning. When people throw out this magical "common sense" argument I find it pretty insulting cause not everyone's experiences are the same. Gotta leave some room for growth. Everyone has some missing piece of knowledge that most people would consider the most simplest "common sense" detail.