You are just finishing presenting a tightly reasoned argument. Your facts have been well documented. 

Someone stands up and says "In your opinion" and with this remark the discussion is terminated. 

What they are saying is that all opinions are equal and therefore fact and reasoning are irrelevant. How convenient this position is. It is not necessary to find flaws in arguments, or check facts. This position is the natural home of the unprincipled for precisely this reason. 

How could Galileo prove the Copernican system against a flat earther who shouts "In your opinion"? Unless one is prepared to agree with the flat earthers, it follows that "in your opinion" is not a refutation.