If you’re a recent grad, there’s a 50% chance that your cover letter includes a mention that you “work well both independently and in groups.”
Announcing this is like announcing that you show up for work on time. It’s expected that you’ll do it; it’s not a bragging point.
I don’t know where this trend is coming from (college career centers, are you to blame again?), but I see it constantly, and you must remove it immediately.