Why does Wikipedia react so negatively to help?

Last week I fixed a couple of typos, filled out an info-box and added a citation to an article. My edits were all reverted and I got two warnings telling me that if I continued to vandalize Wikipedia, I would be blocked permanently. Then this week I'm told that I'm the "IP sock" of a user I've never heard of before. What did I do to deserve all this hostility?