Man, Kylie, how annoying! That woman sounds really rude, saying that to you and then speaking for other people like that. That's what art exhibits are, waiting your turn to see something and being polite in the process. Especially when you have an exhibit like that where there are such well-known pieces that everyone will want to see, you just have to be patient!
You can only see so much of a painting from far back or off to the side, you need at least a minute or two to look at it as close as you can (without setting off alarms) and from a nice vantage point. I'm glad you said something to her.
I get really annoyed at the museum when people go right up to a middle of a painting and stand there forever. Like they are oblivious that there might be someone else wanting to have a peek. The impolite people I guess are annoying to me.