Me? I've never put anyone on ignore. Why? Because this is an ANONYMOUS message board, and if I don't know you, your opinion doesn't really matter much to me. Sometimes, there are people who I consider trolls who might actually put out a cogent thought I can use once in a while (although rare, I still don't want to miss out on something good).
Besides, if I'm so thin skinned that phosphor dots on an anonymous message board can form words that will impact my sense of self worth, I probably don't belong on a message board.
And, even with the stalkers, I've found it's more fun to interact with them, especially when they keep trying to say things they think will get under my skin. Best way to deal with them? Respond in a civil, moderately polite way, and inform them as to why you don't agree, backing it up with links. Eventually, when they aren't getting the response they are looking for, they either quit, or melt down themselves, trying to get me upset. Sometimes it's quite comical to see a troll end up having a melt down when they find out they can't get under your skin. I've actually had trolls who tried to insult me that ended up melting down and then putting ME on ignore for not taking the bait.
If a person wants to get under my skin, that can only happen if I care about or value your opinion or you as a person. And sorry, but that doesn't happen in the virtual world. In order to actually matter to me, I have to know you in real life.