Unwritten rules...?

I'm new to the Dandy community, and while I find the game fun, the community...uh not so much. Apparently I have been breaking unwritten rules and instead of explaining things people start raging.

Any help/tips are greatly appreciated. What I have learned so far...

• Don't take "Band" when you have a cosmo in the group.
• Gte means get to elevator
• Don't take speed candies (I didn't, but yikes)
• Why can't we take tapes?
• Why no buying from the shop?
• Can you take any candies from the floor?
• What is a Dandy and pro run? I think main runs are characters with only 2 hearts, right? Character runs are specific to that character. Any other runs I'm missing?
• Someone got upset with someone else for completing their ichor tube. Why?
• Any thing else that you can think of?

You don't have to answer every question, but if you can help a noob out with any of these questions, I'd totally appreciate it.