None of the above.
Is that an option allowed of native speakers judging their own language ?
The group of Japanese female friends whom I once lived nearby, all mothers of small children, considered it perfectly acceptable (non-childish). They may have been suspicious of 'hard,' 'formal' speech with each other but were in no way immature, uneducated or self-centered. Frankly, that is more than enough explanation for any of you...