The term "Alt-right troll" can be used to dismiss any critisism by saying it is a harrasment campaign comes from alt-right trolls.
Despite what common sense might make you believe, alt-right doesn't mean the person in question is a member of the alternative right, they simply a sexist homophobic transphobic cisnormative misogynistic nazi fuckface who dares share an opinion different to your own and therefore should be silenced. Furthermore by classing someone as an alt-right troll everything they say will automatically become invalid and can therefore simply be ignored. Litterally any critisism, no matter how valid, can easily be dismissed by using this term so you can go back to being a happy, delicate little snowflake gently flying through the wind.
Amy: Alt-right trolls are harrassing me and writing negative reviews of my movie.
Ben: Are you sure it's not just ordinary people that just disliked the movie and therefore wrote a negative review?
Amy: No it is definitely alt-right trolls that want to silence me because everything I do is perfect.
by Addict Ninja March 20, 2017
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A very sad specimen indeed. Here is an overview of the alt-right troll:

Appearance - Usually an overweight neck bearded incel aged between 20 to 35 years old. If you don’t initially see them, you will surely smell their pungent body odor that is a result from their poor hygiene.

Habitat- Commonly found in their mother’s basement, where they sit in front of their computers for 14 hours a day, living off Mountain Dew.

Behavior- The alt-right troll’s sole purpose is to “own the libs.” In their sad attempts to do so, they typically go on YouTube and leave trolling comments on leftist/progressive YouTube channel videos. These comments can be anything from mocking the channel to spreading some false conspiracy theory. The purpose of these comments is to trigger viewers, who will fire back in the comment section. This is what the alt-right troll lives for. When they are not trying to “own the libs,” alt-right trolls commonly congregate with each other on 4chan, where they spread their crazy conspiracy theories, and take turns inhaling copium to deal with the loss of their daddy Trump.

Other things of note - If you are lucky enough (or unlucky enough, depending on how you want to put it), you may see an alt-right troll masturbate to pictures of Donald Trump. Alt-right trolls are also typically white supremacists and Nazi sympathizers, who believe that the Hitler and slavery weren’t that bad.

With their lord and savior Trump gone, alt-right trolls are struggling to stay afloat.
If you go to a leftist/progressive YouTube video and scroll all the way to the bottom of the comment section, you will likely see an alt-right troll attempting to trigger the viewers. Before you get mad, take a moment and think about how sad and pathetic alt-right trolls truly are. If you keep that in mind, they will never be able to trigger you.
by Spicyspectrum April 12, 2021
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