That guy suffered no damages. Why would he bring him to a Din Torah?
Right. I guess I'm not saying he should bring him to a din torah, but then where do we see they're all unified? Maybe he means just the seven of them?
Response from Oraita, Rabbi Gad Sebag:
Not saying he needs to go point by point per se, but he doesn't address all of the alleged psulim - even just in his mezuzahs alone. And if you go through the nearly 50 labeled pasul, there are many more psulim that are alleged.
The bitterness and anger of this individual and lack of בנחת נשמעים…. is disturbing.
The purpose here was not to educate customers and to have sofrim improve.
I think the guy clearly went about this the wrong way (unless there's more to the story), but I don't see the bitterness/anger, nor that the purpose was anything other than to educate customers.