Yes, I did the "carry on like they're not there" approach, after my "don't feed the troll" ones. Figure they're so desperate for attention that they will even seek bad attention, just to get some.
I'm not buying an alcoholic a drink, I'm not giving a junkie crack. I'm not giving this one what they want either.
When he started up on me, as well, I went to block him and noticed the comments were across 3 or 4 threads, persistently. Then, when the new account popped up, same threads again.
Just have to keep clicking Report > Ignore & then carry on as if they're not there. Deprive a fire of fuel & it will eventually burn out.