From time to time this issue comes up in discussion, and it should be made clear for everyone here in the FAQ:
Team counters and trash-talking should never be seen outside of the Team Discovery forum. It is in very poor taste to even give the appearance of recruiting in other team's forums or websites, and will not be condoned for any TD member.
Members who have posting tags or sigs should also be cautious about the way they may be perceived outside of the forum. If in doubt, please use your common sense and alter your tags and sigs to avoid offending those from other teams. This will go a long way toward preserving the sense of community among the many DC teams and forums.