I guess, since several people have mentioned some of these, these may not be all that "controversial" but...
* Standing ovations are mostly meaningless these days, especially the recent spate of mid-show ovations. This latest phenomenon reeks of doing what needs to be done to seem "in the know" and current.
* I don't give a sh** what you wear to the theatre, as long as you don't smell.
* Your "job" as a paying customer is to sit down, be respectful of the performers and the rest of the audience, and stay off your f'ing phone. If anything in your life is so pressing or life-changing important that it hinges on a phone call or e-mail that may come during the 3 hours you are at a show, then you really need to reconsider your priorities and NOT be at a show.
* I loved Finding Neverland, and can't wait to see it again.
* Shows that have a lot of unrealized potential make me sad... Amazing Grace is a great, current example.
* I am so tired of hearing how every show is "flawed" and every score is "derivative." So what? There is little in life - worth thinking about, anyway - that is perfect. Why aren't all these arm chair critics writing, directing or performing perfect shows that they clearly know how to create?