I agree 100% - the bickering (and the imflammatory posts that usually precede it) does no good to the reputation or credibility of the posters and will just put people off using the site. Friendly banter is one thing - a lot of these posts are not friendly banter.
If you think your present or past company is better than the rest - good for you - there is nothing wrong with loyalty - just don't keep going on about it (BTW this is a general comment and not directed at Blue Flue people!).
If you see a post like that please ignore it and help us avoid Groundhog Day.