The worst part is there was a funny way to do calling Xanderhal's mom on Xanderhal. The dude's mom has been a bit of a meme after she spent like a week at his apartment streaming with him (likely because she was there to give him a kick in the ass/make sure he's actually trying to make money) so she's well aware of what he does, and the fact that Xanderhal is dependent on her and thus you could plausibly call her to exert influence on him is funny given the context that Xanderhal is an adult who should be making money without moms helping out.
Like, you do a stream reviewing the shots Xanderhal fired, chuckle a bit and say "well, you can talk a big game, but I can talk to your mom..." (or something to that effect but wittier) and then call her up and have a charming conversation where you fish for embarrassing but harmless details from his childhood or something. Hell, if you really embrace the grift, you coordinate this as a work WITH Xanderhal so both of you wring the maximum views from it.
I'm not saying this would be easy, and I'm not sure if Flam has right personality for on-the-fly charming of people's mothers over the phone, I'm just spitballing here. The basic form of the bit holds though: it's funny when grown ass men can be utterly (but harmlessly) undercut by talking to their mom, and I'm pretty sure there's a decent joke to be found in there without looking like a lunatic.
None of this is possible when the situation is approached like a blood grudge (which Flam obviously has against Xanderhal), so it comes off as unhinged instead.