Communication is key to ensure good professional relationships. Non-verbal communication skills are often more important that what is actually said.
Active listening is important. Listen well before forming an opinion.
Sometimes it is difficult to relax when someone is being confrontational but open body language and a non-threatening tone can help to disarm a situation.
Engage in constructive professional dialogue by first listening.
Acknowledge the impact of your physical and emotional state on your reactions. Recognise if you are hungry, thirsty, tired or stressed and take measures to remedy these early. It is equally important to recognise these in colleagues and help them to manage themselves.
Should a colleague be continually difficult to communicate with, it is appropriate to raise this with them, either by yourself should you feel confident doing this, or discussing with a trusted colleague or educational supervisor who will be able to advise you further.
Remember to comment on an individual's behaviour and how it makes you feel and not on their personality.