I would not be surprised If Skids and Mudflap made jokes about Jetfire. I would guess that was what Jetfire was complaing about in the Showest footage.
They probably are scared at first, 'cuz he's a giant Decepticon, only to nervously start making cracks, which results in a violent reprimand from Jetfire, followed by his grumbling. (which is the grumbling in the Showest montage) That's what I think may happen, it's not exactly hard to guess, though.
I'd say it's pretty much a given that the young, immature, comedy relief bots end up making fun of the old crippled bot at some point.
Yeah I could see them pestering everyone - The Jetfire thing is plausible - They could be constantly annoying Ironhide who constantly threatens them and wants them to leave. - Optimus is too nice to be mean to them, but he will plead and beg with them to get off his back (maybe literally ) - Bumblebee will probably constantly facepalm from the stress created from this too dimwits who can't focus or stay serious about anything. - Wheelie will probably join their fun in making fun of Jetfire and Ironhide and others. I hope that they don't make Wheelie too serious of a character or else he won't really be Wheelie. Idk who he would end up as, but not Wheelie.
As long as Jetfire gets to reprimand the twins by whacking them upside the head with his cane than I wouldn't object to such a scene.
Yes they most likely said he was _icthy, rusting and wretched and old so he said "_icthy, rusty, wretched my ass!"