Someone cited my paper in an irrelevant manner I checking my google scholar page, when I noticed that one of my papers, of which I am a co-author, had been cited by an unknown academic. I read the article, which was on gene regulatory networks, and my paper is in computational neuroscience. The reference wording doesn't make any sense though. The only connection is the concept of an attractor network.

If I met this person at a conference, and he went about relating my paper to his work, I would call nonsense. This must happen to more well known academics all the time, so is it best just to let these things slide? I suppose if I was really famous and getting 200 citations a week it would be too hard to track every bad reference down, but I only have a few.
Well, what can you do? Not much. I can confirm that it does indeed happen… sometime people even cite a paper of yours to justify a conclusion that you have not reached in the paper, and even one that you strongly disagree with.

One option is to let it slide. You are not responsible for the content of papers that refer to yours, or the accuracy of their citations for that matter. The paper author is responsible, and to some extent, the journal’s referees. (I tend to spend quite some time checking citations  when I review papers, but that might just be me being overly sensitive to this particular issue.) 

Another option is to contact the paper’s corresponding author, and ask him point blank. You have read his paper, and you are unclear as to the extent of the connection between his writing and yours. See what it gives.

Finally, in the current way academic research works, you do not really have any mean to call out their behaviour publicly. I do not believe you should, either.