Sometimes, I will type a reply then delete the whole thing and see if I feel like typing it again. If I don't feel like typing it again, I wasn't that invested in it. If I do feel like typing it again, that first one was just a rough draft and I've given myself more time to think about it.
Edit: Sometimes, I just reply with "lol" and nothing else.
@jrdepriest lol @shinmera