You can have a spirited debate without necessarily having heckling, and you see that in a lot of spheres. Lawyers do a good job of doing this by being respectful in the courtroom but still having a very significant debate with their esteemed colleague across the table.
I think spirited debate is great and everyone wants to see that and to see that passion. I think when you're demeaning other people as part of that process then it's not that kind of debate.