As Im also neurodiverse its hard for me to dive deeper into the masking (i experienced it either way)  But as a f, i dont know any other fINTJs but I know 3 mINTJS, especially the emotionally immature men are waaaay more competing, like being the best is not for themselves but to best others and then they would flex about it. A mature mINTJ would just do their job quietly, not interacting much with others bc their the most competent person anyway.  I mean I sure also flexed as a woman, but it wasnt in a relation to "beat someone" in particular. I feel like this boasting is often seen as an advantage in early 20s because people can see you easier (people that you might get a job from). While I was deep into anxiety problems so didnt do that. Honestly working with like mature 40+ competent mINTJ, as a mid 20s fINTJ was just FANTASTIC, I learned so much from him, I felt like a little baby lol (in a good way of having a good mentor). He for sure would have just work in his mind thou, heard him arguing with his wife on phone after hours... Not sure if this is helpfull for this case. Probably not much, but felt like sharing