It's likely that the "too heated" is GitHub putting words in the mouth of the repo admins. I don't think you get to choose the text of that message. ETA: The o

It's likely that the "too heated" is GitHub putting words in the mouth of the repo admins. I don't think you get to choose the text of that message. ETA: The options are "off-topic", "too heated", "resolved" and "spam". It looks like you can also elect to not give a reason, though...