I agree with Abdallah, it depends on the opinion. I will always respect their right to think freely and hold their own opinions, even if I don't respect the opinions themselves.

Like for example, if someone holds the opinion that "women shouldn't be allowed to vote" then, of course I'll respect their right to hold that opinion, but I won't respect the opinion itself.

it depends on his opinion

If that someone does not want fight, he or she just says opinions, of course I respect. 

If that person says : I am only one and my opinion is only one, I do not respect. I want to fight :))))

I don't care about somebody's opinions if it doesn't match with my own one as long as I'm not talking with a close person. I believe most people are stupid, that's why I'm don't care what they think. :)