Honestly, I can create a flow chart with the red flags and their corresponding right-wingers and non–MLs.
Slandering AES is a certain way to find a non–ML. If they believe Atatürk was a leftist politician determines whether they're an ultra or a left anti–com.
Condemning the global north but using its talking points while talking about contemporary politics is a solid sign of a right-winger. I don't bother about finding their tendencies, but they tend to give it away with their rhetorics anyway.