Definition of "Trolling" and/or "Troll"
In Internet slang, a troll is someone who posts inflammatory, extraneous, or off-topic messages in an online community, such as an online discussion forum, chat room, or blog, with the primary intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion. The noun troll may refer to the provocative message itself, as in: "That was an excellent troll you posted". While the word troll and its associated verb trolling are associated with Internet discourse, media attention in recent years has made such labels subjective, with trolling describing intentionally provocative actions outside of an online context. For example, mass media uses troll to describe "a person who defaces Internet tribute sites with the aim of causing grief to families."
Definition of "Flaming"
Flaming, also known as bashing, is hostile and insulting interaction between Internet users. Flaming usually occurs in the social context of an Internet forum, Internet Relay Chat (IRC), Usenet, by e-mail, game servers such as Xbox Live or Playstation Network, and on video-sharing websites. It is frequently the result of the discussion of heated real-world issues such as politics, sports, religion, and philosophy, or of issues that polarise subpopulations, but can also be provoked by seemingly trivial differences.
Deliberate flaming, as opposed to flaming as a result of emotional discussions, is carried out by individuals known as flamers, who are specifically motivated to incite flaming. These users specialize in flaming and target specific aspects of a controversial conversation, and are usually more subtle than their counterparts. Their counterparts are known as trolls who are less "professional" and write obvious and blunt remarks to incite a flame war, as opposed to the more subtle, yet precise flamers. Some websites even cater for flamers and trolls, by allowing them a free environment, such as Flame-Wars forum.
Definition of "Constructive Criticism"
Constructive criticism is criticism in which the focus is on improving the content of a work or behavior of a person while consciously avoiding attacking the source of the work or behavior. Such criticism is carefully framed in politically sensitive language, often acknowledging that the critic themselves may have a fully or partially mistaken perspective. As such, insults and openly hostile language are avoided, and ideal constructive criticism is peppered with phrases like "I feel..." and "It's my understanding that..." and so on. Also, critics should strive to put themselves in the position of the person being criticized.
See the difference from these 3 things?
Here's a prime example of the OP calling everyone who said the mod already existed a troll.
tl;dr: Don't call everyone a troll because they are doing one of the above definitions.
[Note to moderators - If this should be in off-topic, my bad, I thought it would go best in Drama]