[Pat Arnold]

Cheer: To shout approval, encouragement or congratulation; applaud
Spirited: To impart courage, animation or determination; to inspire
From The American Heritage Dictionary, 2nd Edition

In my opinion, team spirit can be shown in many inspiring ways; standing & blocking other's view of matches is not one of them. Standing as a "visual depiction of excitement" seems unnecessary; I've stood in a lot of lines and excitement was never depicted.

Courteous: Similar to polite but implies a more voluntary, generous consideration which is of a helpful nature
From The American Heritage Dictionary, 2nd Edition

It is hoped that all spectators and FIRST participants strife to be courteous, both when considering standing in front of others or in freeing up unused seats. I personally remind our team and anyone blocking the view during matches to sit. I've never needed to ask a whole team to consider this, usually it is a few spectators who are restless and doing anything but actually watching a match. Permitting others to see what they are at an event to view seems a basic courtesy. Standing when your team or a match score is announced, but not during the match itself, seems a reasonable compromise.