Wikipedia War? Unfair Attack?

I was checking my competition's backlinks the other day, and I noticed a competitor of mine had a backlink from Wikipedia.

Although I believe it's no follow, I checked it out anyways. It was a wikipedia article on the profession of what my site is about.

When I looked at the external links at the bottom, I noticed, 3 backlinks to different sites (that are my competition) using anchor text.

I decided to include the anchor text of my site (it differed from the other 3) and i posted my link at the bottom of the list (not at the top, nor did I alter or delete anyone else's links).

The update was immediate, and of course, when I went back to check the links today, all of them are gone except one site thats not mine.

Am I mistaken, was the website owner just being a jerk, deleted all his competitions links, and just left his.

Should I even bother worrying about this?

Just curious for your feedback.

Thanks,
Ryan