A (long) time ago, I noticed something not dissimilar in my behavior. I've never noticed it in others, so it quite likely that your behavior goes unnoticed too.

But what I did was tell myself to not react like that again next time. Of course, that didn't work, but it made me notice it better. And after repeating that for some time, I had timely control over the reaction (not over the stimulus that provoked it). If your tic is light and annoys you, you could try that. Your subconscious is capable of picking up more than you think, and it is (somewhat) malleable.