Those Jellyfish just look so squishy, how about giving one of them a hug.
Seriously I think I may find myself unable to keep my mouth shut if I saw someone ill treating marine animals. Most scaled fish have a mucous membrane, which protects them from infection, touching and handling them can damage this leaving them vulnerable. Puffers are not scaled fish, however they also have mucous membrane, and are actually more prone to infection if it's damaged than scaled fish.
I have in the past kept (Captive bred) puffers in an aquarium, and found them to be inquisitive and intellegent creatures, and a tad psychotic. I've never seen them inflate and nor would I want to, puffers deliberately inflated underwater not only suffer damage to mucous membrane from handling, but can die later from the stress of this "Defensive Action". In cases where Puffers are hauled out of the water by snorkellers or divers and inflate themselves with air rather than water, the implications for the puffer can be catastrophic. "Burping" a puffer that has ingested air has varying degrees of success dependent upon the species. In the domestic environment, aquarium puffers should be treated with utmost care, they are sensitive to changes in their environment, transferring them from one tank to another has to be done very gently, and with containers rather than nets. The shock of being manhandled can result in them becoming ill and dying weeks after the handling.
I saw a video on u-tube of a moray eel being harrassed and driven from it's hole by what I assume to be a guide, the eel seemed to be intent on returning to it's hole, only to be prodded again and again until it had swum around the heads of the tour group. If you see this kind of behavior speaking out is the only way to get people to stop doing it. Telling a dive guide how disgusted you are is going to result in embarrassment on the part of the guide, and reflection of conscience by those observing.
These cowboys are showing off macho stunts for their own egos at the expense of the creatures in who's environment they are merely guests, and in so doing they are encouraging the tourists who pay them that it's alright for them to do it too.
Unless the animal demonstrates a curiosity and wants to play, be satisfied with observing it in it's natural environment.