During #PitMad I was fortunate enough to get likes from two editors at reputable publishing houses. Huzzah! Except... both editors only take manuscripts through agents. They did mention wanting to be your submission list if they liked your pitch, should an agent send your MS to them.
So, my question is, when I query agents that might be a good fit, should I even mention these editor "likes," or will it just make me look like an arrogant asshat?
For starters, just asking the question means you are not an asshat of any kind.
Asshattery is largely performed by folks who don't think about what they do or say; they see the world as a reference librarian on demand: put on this earth to answer questions and solve problems for them and (the arrogant part here) no one else.
Now, to your question: YES this is something you put in your query.
And despite my oft repeated instructions to put all that stuff at the close of the query, I'd lead with this.
"My #PitMad entry for this book was given star/likes by Luious Lucy at LotsABucks Publishing and Snobby Snodgrass at Snooty Rooty Tooty Publishing"
Then you start the the query as you would normally:
She was a dark and stormy knight. Sir SharkForBrains and her trusty steed Plodgrass were set upon by ruffians. Ruffians who spoke the Queen's English but looked more like the Queen's gargoyles.