Unless you say Sandy Hook didn't happen and then the parents sue you to death
There are four elements to a common law defamation claim. A claim will fail if it does not have
all four elements.
1) A false statement purporting to be fact;
2) Communication of that statement to a third party;
3) Fault to the degree of negligence or actual malice depending on context
4) Damages (i.e. a showing of harm)
Alex Jones' claims that the murdered kids and parents of Sandy Hook were actors—that was a false statement purporting to be fact. And Jones' followers harassed the parents for years—damages.
But
@Iamnothere000 was not making any false statement purporting to be fact. He did not falsely claim, as Jones did, that the shooting was a hoax. Indeed, he acknowledges the reality that almost two dozen individuals were gunned down in Robb Elementary that day. Nor has
@Iamnothere000 e000 actually caused any damages that a court would recognize. "My feelings were hurt" doesn't cut it.
@Iamnothere000 was expressing an opinion, not a statement purporting to be fact, on what appears to be a matter of public concern. My interpretation of his opinion is that parents whose children are killed in mass shootings should simply "get over it". It's an offensive opinion, to be sure. But "if there is a bedrock principle underlying the First Amendment, it is that the government may not prohibit the expression of an idea simply because society finds the idea itself offensive or disagreeable,"
Texas v. Johnson, 491 U.S. 397, 414 (1989).
And as a general matter, speech on a matter of public concern is immune from civil liability. That's why it's legal, for example, to picket the funeral of a veteran with signs such as "God hates fags" and "Thank God for dead soldiers"—see
Snyder v. Phelps, 562 U.S. 443 (2011).