To disagree is healthy; to criticize the differences is judgmental and inappropriate. Simple, basic respect dictates that each individual has the right to know his or her own truth and to act on it, as long as it does not infringe on the rights of others.
If someone disagrees with you, there's room for healthy discussion and debate. The process can bring a new perspective and/or understanding to both parties.
But when someone speaks from ignorance, rejecting the opportunity to learn additional information, and condemns others for their views simply because they are different, this is action that flows from the insecurities of the person who would judge.
It is also an egregious attack against truth and integrity. It is hard to walk away when confronted with someone whose only motivation is to prove you wrong, a kind of arrogance in that the attitude basically says, "I'm right, you're wrong, and my way of thinking is the only way."
There is never one way, one truth. Truth is as numerous as the souls who inhabit - and have ever lived - in this physical space. Today, if you are confronted by someone who is close-minded and judgmental, be rooted in your own truth; seek to have an honest and open dialogue; and be willing to walk away if the other person is only interested in proving you wrong. Remember that no one can jerk your chain without your permission."