A guy tells you he has been around the block multiple times and so you talk to him like he is a beginner.....That's an excellent way to spot a political extremist; they love giving their opinion but refuse to discuss other opinions. They'll respond to disagreement with insults, trolling, whataboutism, and anything else but staying on topic.
If you see someone you are not sure about, put your cursor over their avatar and you'll see the number of messages they've posted. Click on that and scroll down for a quick digest of their online personality.
Awesome.