I agree with both of you ladies. A sign popping up every now and then is ok, but holding it up the entire show is rude. I am only 5feet tall and I like to be in the pit. I get there early and am usually front row, but if not the signs make it harder to see. I did the VIP a few times as well and I agree, there was no getting in the pit, seats are better in that case.
I don't mind them going up every now and then to flash the artist so they can see it BUT i'm with you and find it rude to hold it up the whole time or for long periods of time. But for me i always like to be right in front so i never have people in front of me to be able to block my view.
holding up signs = rude