The idea that having crappy stats is somehow tied to good roleplay and a lack of powergaming - 8 CHA is usually scoffed at as powergaming and dumpstatting, but 8 STR builds character. Why is being weak physically, which may not even affect your personality, somehow 'better' than not being a people person?
I think that it is because combat is so key to many campaigns that having a PC who has cruddy combat stats is making a severe sacrifice in the name of role-playing...
unless he's a spellcaster.
Its kind of the flipside to people who call sub-optimized PC designs (like giving up caster levels, OH NOES) "horrible" and the like...sometimes going so far as to get angry at players who like such builds (esp. in point-buy campaigns, as it so happens). Its as if you betrayed them personally.
I don't understand the utter lack of interest in exploring the various RPGs some people have. One of my best buddies- with whom I've gamed since the mid-1980s- has opted out of every non-D&D game anyone in our group has run.
Not every non-fantasy RPG...non-D&D.
(OTOH, someone may have slipped a rufie into his beer- he's actually making noises like he's considering making a PC for my upcoming Supers 1912 campaign.)