You can exclude people from your Facebook ads directly by excluding specific Industries, Business Names, and Job Titles. You can also ban people from your page or remove them from liking your page, here's some info from Facebook directly on that:
Keep in mind though that we don't recommend this (or focusing on this) because they are your colleagues in your market and while they can attempt to "copy" your ads, they don't have what your team has of course (and that's the entire Curaytor system). It's best to keep your focus on your business and its growth and not on your competitors. It goes back to the old saying: "Winners focus on winning, and losers focus on winners".
I hope this helps and have a wonderful day!