He's sensory seeking.
He hasn't read the rulebook on how to play with things in the way they are supposed to be played with, he is just learning about the world and exploring and doing the things that feel good to him. He's not feral, it is just how your child is learning about what is going off around him.
If you liked to knit, and you went to a group where there was knitting and then another activity was a Ted talk about all 10000 varieties of tomato or the invention of LCD screens, something that I'm sure you could not give 2 flying fucks about I'm sure you'd also just sit in the knitting corner. That's what he is doing with the bubbles.
There are something like 32 steps to eating, and exploring food and it's textures with our skin is an important part. Not just for that food but to compare it to other things around us. This banana is mushy, what else is mushy, bubbles aren't mushy, maybe sand is mushy, etc.
He's also at an age where he is learning about boundaries. To learn about how boundaries work, you've got to cross them.
Frankly if an establishment has a hard no on children entering a certain area I think it's on them to make it childproof, because a curious mind is an intelligent mind, and he's just doing what feels right to him. He's basically entered this world like an alien that doesn't know the language or the rules or the customs and he's got to figure that stuff out, and that is all he is doing. He's also learning about emotions and cause and effect. If he keeps doing this, then that happens, and he can make it happen over and over and over, and he will keep doing it until something changes or he gets bored.
I don't think you should deprive your child of these experiences but I also don't think you should force yourself to go, because you've got to have the energy to redirect him.
Also nobody will be judging you.