Different people have different opinions. If you are here long enough, sooner or later you'll come across someone whose opinion differs from yours, or vice versa. And no matter how solid your arguments are, no matter how right you may be about a particular issue, if the person you're arguing with is dead set in his/her opinion and won't budge from that position, you'll never change his mind.

What to do in such a case? The same thing you would do in real life, if you were in a similar situation. Walk away, or if that's not possible, just don't engage them after they've made their point. You're not going to change their mind by arguing with them (or by calling them names), so there's no point in doing so.

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They say you have to look a man in the eye to know if he's telling the truth. Well, that's a bit tricky in the online community. So, even when people seem nice, keep your guard up and watch out for their hidden motives.