hmmm I don't know really, I haven't tried that =)
I don't think at this time there is a facility to do this.
I believe that Admin has this in mind to do but it's a low priority.
In the meantime we must hope that those who post a comment on a profile page do so with regard for the sensitivities of the profile page holder.
You could comment yourself 25 times and send an offending comment off the page but this is an extreme way of doing it.