Anyway though, Fi types aren't the only ones who think that--some of them just tend to lose focus when typing their favorite musicians and assume that the ones whose music they feel the biggest attachment to must have similar psychological profiles to them. I can see why it's comforting to believe this, but there's not really a rational reason for it.
That's all I meant by that. INTPs are perfectly capable of mistyping people too; they just do it for different reasons.
No matter who you are, you'll find people from all types (and even from your own type) doing things that seem irrational to you. It's hard to pin down this term enough to use it as a sort of litmus test for T vs. F types.
When pushed too far, Ts will sometimes lapse into the grip of tertiary or inferior F functions, which will respond even more childishly and with less awareness of context than the standard "emotional response" from an F type. Granted, they don't do this very often, but when they do it's ugly. For example, an ESTP when he believes he's been intentionally publicly insulted (how rude!) for no logical reason (how incorrect!)--Fe's smaller influence sets off an Se response.