Do you use the kids urinal?

[CD56]

So earlier today I was using the restroom. It had one stall with a toilet (which was occupied), one regular height urinal (which I was using), and one shorter/kids urinal.

Some guy walks in, sees the situation and waits for me to finish so that he can use the regular urinal instead of the kids one.

Is this normal? Personally I don't care and use the kids one if it is the only one left. I have also used it so as to avoid being directly next to another person who is peeing.

Also, since I was thinking about this for a good portion of my day, what is the point of having urinals of different heights? Why not just have them all short enough so that even short people and kids can use them? It's not like they would be any less usable by those of us of normal height if they were a little shorter.