Not really related Jason kissing someone (which I think is highly unlikely!).
So now that I looked up this white party and have my forensic analysis glasses on I see that Jason was with Gronk and his girlfriend who went on vacation with Shawn a few months ago...
and Kaitlyn was supposed to go to this party but ended up being too sick...
I’m probably reaching here but I wonder if she didn’t want to deal with any awkwardness seeing them? I know Shawn was more-so friends with the Deckers but I remember a post from that trip that was like ladies holding Shawn up and talking about supporting him.
I’d probably rather stay home and snuggle my new pup instead too though.