I'll be honest in that I don't remember the scene. I don't know if I even saw the episode, to be honest, so I'll probably never know the exact context for this gif.
Personal space is one thing, but just how PB and Marcy, two long-time friends of Finn who they've shared so many memories with and saved eachothers' lives on more than a few occasions, both just so disgustedly brush him off like he's a stubborn fly really gets on my nerves.>>110408501
They didn't need to be snogging in the middle of the finale, yeah, but in the whole ending sequence where they spend so much time giving us a last peek into the lives of all the minor characters we've known through the years, Huntress Wizard's last shot doesn't have Finn anywhere in it, she's just meditating alone. For how many episodes and arcs they had about Finn's romantic life, you'd think they try'd to at least give the guy some closure in the finale. Huntress Wizard was literally only made relevant because PB, Marcy, FP, Susan, and any other romantic option for Finn is either happily single or a lesbian now, but still Finn couldn't get any real confirmation of a happy romance in his future in the finale.