Ok, here's how it works
If you ask a question that people don't like, or for whatever reason, they downvote you.
You need 15 reputation to vote up, or as you say, plus voting.
You need 125 reputation to vote down, or minus voting.
Yes they are allowed to be anonymous judges. You are too. The purpose of this anonymous voting is to make sure that people don't ask a bunch of spam questions.
I presume you are talking about this question.
I am wanting to write an xmpp server on my .net server at my webhoster. The only free xmpp library I can find is agsxmpp. But the webpage there says it is only compatible with .net 1.1 or .net 2.0. So am I out of luck?
People will downvote you if you ask a bad question.
Losing reputation is not the end of the world.
Don't respond with hate comments. Or hate posts, for that matter.