Interneting is a contact sport, and sometimes a collision sport.  When someone knocks you flat your backside might hurt,  but don't let your feelings get hurt. It is all in the game.  To the extent possible put your anger in your pocket and figure out your next move. Remember there are fans watching from the sidelines.  The best course is to ignore the venom and keep your response professional, helpful, friendly, and on-topic.  If in fact you said somethig wrong you can offer a brief oops. But the oops is not an apology. It is an acknowledgment of a mistake.  Move on.

Don't crow in victory, and don't cry in defeat. 

My array of listservs (mailing lists) in the publishing area include:

ind-e-pubs@yahoogroups.com (may be dead, I'll check)

pod_publishers@yahoogroups.com

Print-On-Demand@yahoogroups.com

pub-forum@pub-forum.net

publish-l@googlegroups.com

Self-Publishing@yahoogroups.com (I co moderate this one.)

 smallpub-civil@yahoogroups.com

For book design and graphics I follow these:

graphic_design@yahoogroups.com

 publishingdesign@yahoogroups.com

My array of typesetting and programming listservs is too bulky quote here.

The word "group" is a bit vague whe discussing internet fora. The above are all listservs, but most are addressed via googlegrooups or yahoogroups dot com.  Internet news groups are another species altogether.  I visit and sometimes query on newsgroup comp.text.tex. But most of my surfing and postings on news groups deal with technical computer issues. 

Enough for now.  You might want to print out the above listings for future reference, or book mark this item.