No, I don't think there should be any set rules.
It's just internet debating.
Besides, if someone gets a little too mouthy with you. What's to stop you from getting mouthy right back. If they can dish it out. They're going to have to take it, in return.

People have many different oppinions. And, of course everyone is going to think their own oppinion is the best oppinion. You don't form an oppinion & defend it, because you think it's wrong.
If you're going to lay it on the line & advertize your beliefs. Then, you have to expect for other people to have counter oppinions. They may not be nice about it. But that's the risk you take, when you get into things like this.
Either step up & defend yourself. Or fall back & keep your mouth shut.
But whatever you do. Don't let your mouth write a check your ass can't cash. There's nothing more pathetic than someone who starts trouble. Then, pussies out, when it comes time to back your shit up.

That girl isn't as hot as she thinks she is.

On debating, eh...none of it really makes a difference in my life anyway.

I still get 4 hours of sleep every night. I still get over charged by supplement companies because they have a product I want. My dog still takes up more than 1/2 the bed and wont move. I only get to see my girl 2 days a week right now. My diet Coke is warm. Its just business as usual whether or not I debate. People that debate are already set in their ways. You're not going to change someones mind either.

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The following image was attached:

My T Shirt would read " Dont Bother, I dont F**K Babies "

i just call someone some fancy term for homosexual and walk off

I want a cookie.................

I don't think theres anything wrong with a good debate every now and then, it keeps things spiced up a little bit! I do think you can keep it kinda nice though, you don't need to resort to name calling or whatever it's really silly to get all mad about peoples opinions, because thats all it is. You can't really change the way someone feels about something, but its interesting just to see how other people feel about an issue!!