Pretty sure lots of people would read x post as cross post, not just influencers. ‘X’ to stand in for cross is a fairly old convention; I think I’ve seen 19th century examples.

If you do it in person you have to say X with a slight look of disgust in your face, to let them know what you're talking about.

Most people I know only knows about X/Twitter from the news cycle, it's not something they themselves use, it's just the platform used by journalists, politicians and commentators. It's not a place normal people go.