For example, this question was closed:
closed as not constructive by Walter♦ 10 hours ago
It would be cool if there was an option of down voting the closer/close.
Also, why was one person able to close this? Shouldn't it require five votes?
closed as not constructive by Barry, Yi Jiang, jmfsg, gnostradamus, Pops♦ Jan 18 '11 at 14:41
As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.
That one person is a moderator (the diamond after their name indicates this) - whose votes are binding.
If 5 3K+ users disagree they can vote to reopen the question thus overturning the decision. So if you have 3K+ reputation on the site you can add your vote to reopen.
If you don't have 3K+ reputation you can either:
Finally you can raise a question on the site's own meta where you can bring it to the wider community.
One person can close questions only if he is the Moderator. The person Walter you have given in your question is a moderator and hence he has the rights to close the question.
The question linked by you also has reasons on why it is closed. You can read that link which says six guidelines for constructive subjective questions. If you still feel this question should be re-opened, you can add a comment as ChrisF has suggested in his answer.