I have noticed how hard for me is NOT to say my opinion straight away after I have heard something I disagree with. However, I have also noticed that when I keep proper control of my emotions and patiently ask other students to give their responses and  then ask to evaluate the answers, the result is that they most frequently elaborate on quite an acceptable answer, and remember it much better than after my comments. In conclusion I may say that I am in the process of becoming a better listener and facilitator.