Something similar has already happened.
Around 2 years ago to me, I was confronted over the current rules concerning the recent changes to static weights governing no-thumb bowlers who have a thumbhole. (CG is now in the bridge)
The big problem with that is I was confronted/harrassed by a PBA member when I was bowling during OPEN PLAY. (Really, it's OPEN PLAY! Who gives a crap!) He also gave me crap when I was shopping at a local Target store. (He's a MUCH larger guy than I am)
I've contacted the PBA as well as local police about the Target incident, but I don't have the correct full name of the guy, but I would think the PBA could narrow down who it is and have a word with him.
I think in this type of situation you just have to realize you're dealing with a crazy person who, most likely, has problems with himself. You just have to say whatever is appropriate to diffuse the situation, whether you agree with what you're saying or not. The goal is just to make that person go away.
But to that point, I do see someone like BeerLeague (BeerLeague, I AM NOT saying YOU in particular) who is old school, appeals to tradition, "we've always done it this way", "THEY'RE the problem" who IS likely to want to pick a situation over someone simply not tolerating someone who is not playing by the same set of rules.
Again, I agree the USBC sucks at a lot of things, but you can't have someone competing in sanctioned competition that is playing by their own personal set of regulations. In non-sanctioned play or tournaments, guys should feel free to use weight holes or super juice ball juicer or whatever that shit is during competition.
I'm pretty laid back .... but here is the thing...... I have seen SO MANY 2 handers CHEAT all the time .... thumholes they may or may not use, flipping the ball around backwards, just tons and tons of BS .... they shoot their honor scores, destroy every pattern they bowl on because they cannot, or refuse to play the pattern straighter until the burn develops, and basically thumb their noses at the rules for YEARS.
I don't means to say all 2 handers are cheaters, BUT there sure has been a lot of rule bending by a lot of them. You cannot deny those actions are the catalyst for the new rule changes.
Now I have to plug and destroy my equipment because I have been playing by the rules for years? I'm not going to do it and I am quite sure I'm not alone. What about all the thumbless recreational beer bowlers with their 15 year old resin ball? You going to tell them its illegal now? Do you think they care? Do the league secretaries care? Do the proprietors? Who is going to enforce these rules? THe USBC won't even tape a lane anymore when someone shoots 900.
Its just madness ... and enough noise will be made where the rules will change by the time they are scheduled to be implemented.