AITA for getting annoyed my GF was eating off the plate as I was trying to grill?

Last night I finished a softball game and texted my GF to see if she'd like to come over and I'd make us food. We were in a bit of a tiff the night before so I was hoping to have a nice chill night to get back to normal. She says yes so I walk to the butcher, get the goods, and meet her back at my place. I turn the grill on to warm up and go upstairs to where she's laying in my bed. Off the bat she makes a few jokes about how ugly our new team shirt is (it's ugly). I head back down to cook while she stays in bed and when I'm halfway down she says, "Wait can you help me with something?" I come back up and she points to an article of clothing next to the bed so I just chuckle, say "Yeah right", and go back down - half annoyed but also half in the playful way from the jokes about how bad I looked in the ugly shirt. Mind you, the grill is on MAX downstairs this whole time. Later she said it was her shorts and my roommate was home (on that floor) so she couldn't get out of bed for them. Guess ITA for that?

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So, annoyance from that plus the night before is building up for us both. As I throw everything on the grill she tells me she's starving and asks if I have snacks. I say not really but the food shouldn't take long. I turn the burner up on some stuff I think she'll like most so I can get it off the grill for her. I put a sausage on a plate on the wing of the grill and she eats it pretty quickly and shares some. Then, as everything else finishes up I have to start loading that plate up. I'm piling 2+lbs of chicken & sausage on and as I'm doing that she's using utensils to eat it. Not the apocalypse but it made things more difficult.

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I admit, as this was happening I was getting frustrated. I tried not to snap but she swears I did. I told her pretty plainly, "Hey I need to use this plate" to which she starts going off, half laughing, along the lines of "OMG calm down. I'm not hurting anything. How am I hindering you at all?" which of course just irked me more. If I'm grilling for you and I'm telling you that you're making things more difficult, why can't you just be like "Oh my bad, I'll wait two minutes for you to finish."

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This all digressed into bigger themes of her saying she doesn't want to be with someone that "loses their shit" (I can be impatient sometimes, 100%, but I absolutely didn't "lose my shit") over trivial things and me saying that she seems to have a hard time actually hearing/listening to me and respecting how she's affecting me. It feels like in moments like these it's her world and I'm just living in it. It's especially frustrating because its all SUCH stupid shit and on the things that really matter we have such a strong connection. For reference we're both mid 20's and she's ~120lbs so it's not a food thing lol.

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So loooooooong story short, AITA for getting frustrated she was eating off the plate while I was trying to unload the grill?