How do you feel when someone deletes your reply to their question?

I answered a question in a polite and factual manner. I then complimented and thanked them for their sentiments although I had disagreed with how they'd worded the first part. It was, in my opinion, impossible to do. They promptly deleted.
I then noticed they'd deleted another's reply. *sigh
I find that a little annoying and quite childish actually.