For those that are interested in once & for all dealing with unwanted, troll-like comments on your blog – choose to “moderate” comments.
In your blogspot ‘dashboard’ choose the SETTINGS button
Under SETTINGS, choose COMMENTS
Select the “ENABLE COMMENT MODERATION” bubble.
Now, if you don’t use blog membership (which I do) all comments will be sent to you via email in advance of them being published. You can choose to publish or reject the comment – no more trolls on your public blog.