(1)  It all depends on the context.  If I "hear"  it.  I never worry about that kind of criticism.

   Besides,  I only cede credibility to those I respect.

(2) In   text-based forums,   such as this medium,  which are for discussion,  I  have little reluctance to address a   knowledge claim.

 So,  such communications are neither distressing nor troubling.

   Of course,   a  person  unfamiliar with Dialectical Method,  may find such expressions an obstacle.

    So long as a person   keeps their mind focused upon   Facts,  such communications  pose very little problem at all.

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A person have the right to disagree with me, personally I would feel challenged as will try to prove him or her  that thier statement either valid or not valid. It will depend on how important the topic/discussion/or arguement is.

If the the topic  is important I would try and add facts to back-up  my arguement/discussions.

Generally, it  wouldn't  worry me that someone dissagree with me.

If I hear the words: You are wrong - I don,t agree with you... Firstly, it catches my attention. I ask myself - Can I explain my thoughts better? If yes I will try again and again. I,m here for practicing of English hahhah... Everybody of us has a right to choose - to agree or not. About this is our free will. If I,m the mature enough and I understand what is "wrong" with my explanations it is only for my benefit. Otherwise I will bump and bump and bump. Maybe one day I will understand and I will agree.

Simply I don't care. :D

I am upset and lose confident and I will feel very nervous next time. But at the other side I think this person is not right too, because all people can make mistake and this person too. I do not belive that he or she has never made a mistake.