I read through that thread. Your post wasn't disrespectful. I agree with what you're saying. Anyone who dies without believing in Jesus and having repented is going to be judged.
Atheists will always find this disrespectful, because they put man above God. But in God's eyes, you are putting Him first. Put no stock in what other people tell you, because you have chosen God. That means we will be persecuted one way or another. People telling you that you are disrespectful when you talk about Hell, that is persecution. Rejoice when this happens! You are doing what God wants you to do, and you are growing in Christ.
It doesn't matter at all how much a person does in this life, unless it's done for God. Because it will all perish. God is not a respecter of persons, and neither should we be. I'm not saying that we shouldn't respect people, I'm saying that we shouldn't put people on a podium for their worldly accomplishments, because that is how the Gentiles live.
Keep your faith! Keep mourning when someone ends up in Hell, because there is no coming back from it. And if God can use you to get one sinner to repent, then it doesn't matter if people are offended, because God and His angels in Heaven will be rejoicing!
And pay no attention to what atheists say to you. They do not know truth!