For what it's worth, I can sympathize that if you're really experiencing toxic behaviour from a large scanlation group there is very, very little you can do to call them out. The vast majority of people will simply not care as long as they get their chapters (as evidenced by the many, many posts above to that effect). Sniping a single chapter of a series they translate is certainly going to draw a lot of attention.
However, realistically it's not going to achieve anything. A ton of people are going to automatically side with the people giving them chapters, even if they're lovely or arseholes, and it's likely you're going to get moderated under the conduct rules regardless.
All I'll say is that I hope we see less situations like this in the future, from all parties.
Edit: And to the people whining about snipers killing series; that's clearly not what they're going for here. Low quality snipers killing series really do get my blood boiling, but this is essentially a very loud callout message instead of an attempted translation takeover. Of course, I'll eat my words if they really do continue to release more LQ chapters, but that doesn't seem like their previous MO.