Comment by nneonneo

It could be self-deprecating! Plus, I would more readily read it as 本人 (this person/me/myself) - than as 笨人 (stupid person).

Also, Pinyin is more susceptible to accidental interpretations than most writing systems due to ambiguity and tonality. For example, “mana” can be parsed into 32 different syllable-tone combinations (man/a or ma/na times 4x4 tone combinations for each syllable), and while most aren’t meaningful, that still gives you a ton of potential words to match against.