It drives me crazy. It happens on the cruise line as well...we just got off the Wonder last week and had two instances of people trying to take our spots, and being very rude about it.
For the Sail Away party, we went up to deck 10 right after the lifeboat drill so that we could watch the party below (the stage was on deck 9). We were not trying to get there before anyone else, but it just so happened that we were one of the first families to get up there. As time went on, more and more people arrived until there were no more spots at the railing. Just as the party starts, a family comes up behind us and starts complaining that their kids can't see. The lady goes on and on about it, and then physically tries to push her kid around my husband so that the kid would be between my husband and the railing....even though our own kids were standing between us and the railing as well (we put our kids in front of us to make more room, rather than having all four of us lined up at the railing...so we were only taking up the width of two adults). We held our ground and would not let the kids get in front of us, and the entire sail away party she was complaining about it under her breath...but loud enough for us to hear!
The second time was at the Pirate Party. This time we intentionally got there pretty early, because we knew it would be crowded. Again, we went to deck 10 and found a spot on the railing. Sure enough, right before the party started we had a little bit of space next to us, and a family came up and tried to squeeze three people into a space that was barely enough for one person. Their kid (who was probably about 13....so not a little one) somehow ended up between the railing and my 8 year old son and my husband, so that I was now arm to arm with this kid, and my son and husband were behind us. After getting there 30 minutes early to ensure we had a spot on the railing, I was not too happy. So I very politely told the kid that he needed to move because my child and husband had been in that spot for 30 minutes. Well, he told his parents what I said and all h e double hockey sticks broke loose. The mom acted horrible! I just pretended I could not hear her. She actually called me a b----, in front of her kid and my kids! She got so mad, that she made her family leave the party!:brick: