You know one of the most interesting features on this Forum is "Clicking" on an Avatar visiting a persons page and looking at their last 15 or 20 posts! Noting at that point that 3 or 4 of their last posts are argumentative, condescending or just plain rude for no reason. Also of note said person barely has over 100 post!!
It's safe to conclude a Troll has slipped into our midst!
now to use the second most interesting feature the "Ignore" feature. Problem solved.