Try to avoid

Try to ignore them as that will hurt them indirectly. These people try to do less work and get more results by showing over smartness. If you avoid them, they will think that you are not competing with them which will mentally keep you motivated towards your work and make him confused if he/she is going to get the result as you are not noticing maybe no one is noticing there work so they may not get the results. If you still think this person is hard to bear, try to minimize the contact with them and avoid as much as possible.