I guess it depends on which kind of alt-right, but if it’s USA trump fans, you can get them to talk about Clinton’s emails with regards to toppling Gaddafi and others.

Use the ““FREE/DOM”” fake neopronoun people’s pronouns as though they were serious, eg. ‘FREE was saying that DOM own freedoms were being violated’, and if they say they say they have no preferred pronouns/ don’t believe in pronouns, refer to them in the opposite of their gender presentation or with ze/zir neopronouns. Never fails to piss them off.

Start infights. Identify ideological differences that are relatively close to fifty-fifty in support and inflammatory in nature, and pick a side and be really loud about it, especially detracting from the opponents. DeSantis/Trump would be a good one. Maybe “Russia is better than America” from the right would get some bites

Also, accuse your opponents of being liberals. This is extremely important.

why bother? do you want them coming here to do the same thing?

Just get them to agree with you on things we actually believe in like corrupt corporations bad and gun rights good and then say yeah if only we had a socialist system all of that could be true.