After receiving a lot of PMs about this subject, seeing a lot of reports of this kind and after one of the global mods PMed me with suggestions regarding this topic, I thought that I should cover it:

Possible (or real, not for me to judge) FUD, accusations or statements are not moderated.

Moderators don't moderate for truth. However, trolling isn't allowed. If a user is habitually posting obviously false nonsense just to stir up trouble, then it's considered trolling, which is prohibited. However, such cases should be thoroughly documented in the report (There are tons of reports that just say "trolling", but moderators don't have time to look through each user's post).

Possible (since we don't have the time or resources to check) insults are also allowed as long as they contain any kind of constructive opinion, info or something else substantial and aren't off-topic. For example, posting something like "you are dumb" will be deleted as it contains no meaningful content. However, if the post is somehwere along the lines of "You are dumb. This is wrong because this website/thread/etc. has explained it's not right", it's in most cases accepted.

Possible scams aren't moderated either due to the fact that's it's extremely hard to make an unbiased decision on a limited amount of evidence and time. Moderators don't have time to be investigators.

Legal note: This is forum policy, not mine.