My personal theory is that both JVR and JM are basically stupid. So they tweeted these things without thinking. And then 24 hours later (or less for VR because people told him straight away!) they thought "oh shit, yeah, I am seeing TH later this week...."
I know it sounds simple. I just think these people live for the moment - they leap on Twitter to comment on the latest controversy and get some likes. And that's all they are thinking about. Then the penny drops. Just as it previously did for JVR when he posted that Hawaii pic (some sympathy for the shitstorm he got then, but to engage in controversy about TH's girlfriend twice shows he is as dumb as a box of rocks).
Not many in showbiz are as smart and as reflective as TH. Or as calculating. Maybe he and TS are made for each other.