By doing so, you are giving them exactly what they want. Thread stalking on the forums is a huge issue. Once certain people realize that you disagree with their beliefs, it does not matter if you place them on ignore or stay out of the bible study forums, they will follow around looking for any reason to criticize you. The sad part is that they won't relent until you leave.
What's worse is the fact that nothing is being done about it. How hard it is it to post a couple of ground rules such as no name calling, no thread stalking, keep threads on topic, no bringing up disagreements from other threads, the list could go on.
The solution is people begin acting like Christians and not heathens. As Christians we are to love all and treat all with kindness and respect, even if we disagree. Not love those who agree and scorn those who disagree. Jesus never played favorites.