'INFPs are humble and kind'
'INTPS are arrogant and bastardly'
Honestly, I do see what you're saying.
Thinking about it, I'll say all things being equal, an INTP is more likely to be arrogant or secure in their superiority in a field or specific area than an INFP. INFPs I know seem to have trouble taking credit where credit is due, whereas an INTP will at least take it graciously or as a matter of course.
However, honestly, I think both INXP can be prone to deep or chronic issues of confidence. The arrogance just masks weaker areas or doubts.
BTW - I'm not saying this is the default INXP portrait at all, just picking out the more extreme negative examples for contrasting purposes.
And Udog - HA HA HA. No. They are mix of male and female. And stop ducking. Hold still. No really.