I don't think there's anything wrong with posting that "I've seen x bad behavior by cyclists repeatedly, don't do that" on a bicycle forum, and find it weird that people would consider that trolling. If this kind of littering is occurring, that's highly relevant to bicyclists because a) it's obvious that bicyclists are doing it and b) the stuff is most likely to pose a hazard to other bicyclists.

If you're littering while biking, knock it off. If not, why are you offended by the OP? I haven't witnessed this kind of littering, but that doesn't mean it isn't happening.

I really don't get the relevance of the beer can thing. Is that whataboutism, or is it two wrongs make a right?