I completely agree. Usually the clue is when:

1. A whole bunch of people all start saying the same thing at once
2. They all really want to say it, even bringing it up in contexts where it doesn't completely make sense. Also, when you examine it, it doesn't completely hold water. It's just a single thought-pattern that matches up with the appropriate concepts, not necessarily something with any connection to reality.
3. They want to "talk" about it, but not in the sense of a conversation, or arguing for its connection to reality. They just want to repeat it, with various levels of insistence, and they don't respond in a meaningful sense to questions or counterarguments. They just repeat the same thing they said before.

Number 3 is sometimes hard to distinguish from just normal internet jerkwaddery, but the conjunction of all the factors, along with the ever-present conclusion "we'd better not vote for Democrats," is pretty noticeable once you start looking for it.

There's a good example here: https://lemmy.world/comment/13459406

Notice how he fills in both sides of the argument to keep it going, to be able to keep repeating his points. For example I say "I also think it’s partly the voters’ fault" and he responds with "I don’t really understand what you’re getting at here. It seems like say you aren’t blaming voters." I say "I can blame Biden for committing a crime against humanity by arming Israel, instead of doing the human thing," and he accuses me of sowing division and blaming the voters, and keeps yelling at me that the Democratic Party is at fault.

Again, it's hard to distinguish from just how people talk about politics on the internet, but the uniformity of the themes and the absence of any attempt at even reading other people's messages and being responsive to them starts to look a little bit glaring after you run into this stuff a few times.