An e-mail list that I'm on generates some very contentious exchanges at times. Some folks feel compelled to respond to everything that they feel strongly about. Others are selective about which they respond to. Some feel that a lack of response connotes agreement with an opinion that they find offensive.
I wish I had the luxury of time to respond to all topics of interest. Sometimes I prefer not to dignify some of the offensive stuff with a response. I encountered a posting today that spoke to this issue rather well. Your $0.02 is welcome here.