Is it right?

The current controversy with a certain fast food chain and marriage has me questioning what some people consider right. Whether you support gay marriage or not is where I question it, but in how some people react to it. I know what the bible says, my grandfather was a preacher. He made sure we learned what the bible says.
The media and the blogs have made sure everyone knows what was said and how people are reacting to it. While I'm not going to give my opinion on the matter I will say this.  Luke 6:31 'And as you wish that others would do to you, do so unto them.'  It is one thing to express how you feel, but when you start to attack someone for what they support, it can make you no better than  the one that you are attacking. The bible defines marriage, but in the end it is the Lord in Heaven that we have to answer to.
So you tell me, is it right when one goes after another for what they believe in?