No it's not ok to respond to posts that violate the rules with a response that violates the rules. You are just about as guilty as the one who started it and you will be subject to infractions.

If you are flamed we expect you to be mature enough not to lower yourself to their level. Report them don't lower yourself to their level. We don't want people to see in fighting between marijuana users for one thing. Second we don't want things escalating from one or two flaming posts to a whole out war. Third flaming someone is the weakest form of debate and happens quite often and that isn't allowed. You can't beat someone with the merits of your argument then you go after them personally, that's not going to fly.

Another situation is responding to posts that talk about banned subjects. If someone starts a posts about off topic substances, you can't use it as an opportunity to respond. Someone posts up porn you can't say well this is my chance to do the same because I didn't start the thread.