...deserve a reason as to why? Maybe there's a good reason that can easily be fixed.
...not care? If they accept or not, it doesn't effect your opinion of the group, DeviantArt, or your own self-esteem.
...get upset? You're doing them a favor to contribute to their little group!
...excpect something else from the group admins than the options mentioned above? Please specify.
...feel a little hurt, but you don't press the issue and find out why? Please know that I hate rejecting submissions, but I hate not sticking to my groups' standards more.