I don't get too many spam comments, but when I do, I usually respond to them, and maybe even throw them an upvote, just in case they are a real account and the person is genuinely trying to get started on Steemit. I give them the benefit of the doubt....once. If they keep posting the same comment on other posts after that, I don't respond to them anymore.
I think only one person who I thought might have been spam commenting me actually ever replied to my reply to them. I guess that was the one real account. I hate to penalize the potentially real ones because of all the fake ones, which is why I give them all one chance.
I actually like spam comments because I can mock them!
But what I mean here is totally fake accounts promoting the zionist agenda which are all over all forms of social media including Steemit...