If people at INTPc are saying this, then INTPc is full of shit. Doesn't surprise me at all that people over there have views as skewed and dumb as these though.
A problem with any unhealthy F function (which xxTx personality types often resort to) is that the function itself often deals in absolutes according to what is right behavior and what is wrong behavior, because people often project. At ANY rate, xxFx personality types are far better at dealing with their F function than xxTx personality types are, because they've been dealing with their function since 1st grade. You'd think someone who's been spending their entire life developing their function would be fucking good at it by now... but no, instead, people create misconceptions that xxFx personality types are horrible at using their most developed function.
If any of the personality types are crybabies, softies, explosive, insecure, and so on, it's every single xxTx personality type, not the xxFx personality types.