Explain why.
For starters, it is condescending. It assumes those whose opinions you are critical of are somehow not thinking individuals, that you are somehow smarter. It is less than a sophomoric attitude. It is, well, junior.
I am not quite sure what your point in making such a statement can be. It can not be with the intent to sway people to your side, to educate them to accept your view. It is offensive and people rarely respond to that.
And anyone looking in on the discussion that might be swayed is going to see your accusation as lazy. It does not explain anything. It only makes a declarative statement without the least bit of support.
If you really believe you are smarter than those who disagree with you but (1) do nothing to explain to them why or (2) believe it without having done any assessment of their intellectual capabilities, then you really are not as smart as you might think you are. That is only a large measure of arrogance.
Your approach may sit well in your mind but rarely if ever is it accepted in anyone else's. Even those that agree with you will think of you as correct but a little twit just the same.
Of course, you are not a twit. You have studied the issue. That I feel rather certain about. And probably a very intelligent person. So, don't be so lazy. Explain yourself. Contribute to the discussion and the learning.
But if you are here only to throw barbs. Well, there are other more appropriate places where you can go to make yourself feel good besides doing it here in public.