As Clara mentioned being aware is a great first start.
Confidence is great - people love listening to those that are confident and as long as you can defend your points using facts/logic go ahead and be confident. Here is where confidence clashes with arrogance
- If you need to put someone else down to make your point - e.g., if you have to say they are wrong in order for you to be right. Instead be open to multiple points of view (...a common technique is to say yes and as opposed to no)
- If you are stating things based on your world view as opposed to facts - e.g., it must be true that this company is not good because I don't like their product
- When you are not enthusiastic except when it comes to your own points - people want to be validated and if you only want to praise your views and disregard those of others even being right is no good
- If you ignore what others say - e.g., if the interviewer is giving you hints in an interview but you insist on doing things your way
There are many more examples. The best thing is to be aware and constantly ask for feedback on this point. Take notes on what in particular caused people to say that and focus your energy on improving those
All the best,