Your doing something wrong. You do not need a "paid subscription" to send Private Messages...... Maybe a Post Count minimum, but no monetary requirement is placed on PM's.
As for the BDF, it is only ONE Forum Page here. There are numerous others where conversations go on all the time with no problems. The BDF itself is one where you have to be "selective" as to which Thread you decide to dive into. As well, once you have been here long enough to figure out which of the Members are the troublesome ones, you learn to avoid their comments.
You can express an opinion, and IF someone gives you grief over it, you DO NOT have to respond to them. Just ignore their comment and move on.
Do not fault Christian Chat for a few argumentative Members. Learn which Members will respectfully discuss issues/ideas with you and which won't.
You can also always use the IGNORE option to avoid even seeing the comments of certain Members you are having problems with. Takes a whole lot of the stress out of the experience here.