I love how the Muppets are such a chaotic group and Kermit is like the only calm and reasonable one there
One could argue that he's used to the chaos, given he canonically has thousands of brothers and sisters and was born into a massive family
I wonder if he felt a little homesick when he left the swamp, and I wonder if upon meeting the other Muppets, it reminded him of home
What if Kermit finds comfort in such a chaotic group of people, even when they stress him out
In the Muppet Movie, when that guy told him there was an audition for frogs in the paper, Kermit initially tells him, "No thanks, I'm quite happy where I am," which would be in the swamp with said roughly 4,000 siblings (according to one interview.) A lot of people with large families like that would take the opportunity to get away from them, if not just to get a little bit of space and explore themselves as an individual.
Kermit does end up doing that but he finds himself right back into chaos and picks up more oddballs here and there who only feed the chaos and befriends them, probably because that's the scene and the type of people he's used to.
From one large family of thousands right into a new found family that makes him stay up to date on his rabies and tetanus shots and keep money stashed aside in case he needs to bail them out of jail