Yeah. If he gives you enough any problems, just stay neutral. Instead, be clinical, and remind him of who he is, that he's (quote)"just another aging fifty-something vanilla sociopath with an internet addiction and untreated mental health issues."(end quote).
That's the line I'd use instead of taking the baiting.
Uber-predator-fail-trolls like that will use abuse tactics oddly enough found in domestic violence situations. Like "baiting", "bread crumbing"(his superficial charm), and then "stonewalling" (when goes for the throat and tunes you out as he does so).
If you are engaging Modda, refer to him as "VagabondSouffle". If you are dealing with "VagabondSouffle" then refer to him as Modda, and do so with any other of his likely many alts.
If it gets bad enough again with him, then you can always put enough effort to get his banned for good with the owner or the regionwide mods (not to be confused with global mods). You have to fill out the complaint form. And then directly email the site owner: dylanwenzlau. Be sure to have many screenshots ready of his most egregious transgressions and urls pointing to them. It takes quite of bit of work from what I can see. But this is the advice given by another troll that used to gun for him that apparently got many of the worst offenders banned. One of them being his best buddy on the site named timber1972, a particular nasty variant of sociopathic internet troll.
Meanwhile, it seems like he is sufficiently spooked. He quickly deleted some of his posts and turned off his comment section on his profile page to cover his tracks. So he's on the run, in a sense, and like most weirdos doesn't like to be outed. So that's your Ace in the hole if he tries to get one over on you.
It's like when Trump was caught for having an alias named John Barron. It would be even funnier if you can find instances of Vaga talking with his other alt Modda, to occasionally get his own back. I'm not sure if he'd stoop THAT low, but then again he was lying about being an alt all that time. So, clearly the truth embarrasses him.
In any case, that's all I got. That's the post. Good luck!