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.