I have been banned from asking questions? Can one bad question equal a question ban?
Out of ten questions you've asked, seven of them are deleted and all of them had negative scores except one. Stack Exchange's algorithm for deciding to question-ban someone includes those deleted questions. Not even the mods have any control over question and answer bans so we can't do anything about that.
Tl;dr: you didn't only have one bad question; you had seven with negative score.
Please read this post to see how the ban might be able to be lifted.