[wwosik]

"normal" letter sounds rather judging, doesn't it? Altough I suspect it is probably a product of an undereducated person.

[soundwave106]

Agreed, simply "please use the unaccented letter" would have been fine instructions. Accented letters are pretty "normal" in many languages.

[occamrazor]

Accented letters are not the only issue. Apart from the already mentioned apostrophes and hyphens, there are consonants with diacritics such as ç, č and ñ, or cases where substituting an “accented” letter with the corresponding unaccented one is not appropriate (e.g. ä in German is transcribed as ae in ASCII).

[cabalamat]

> "normal" letter sounds rather judging, doesn't it?

it is a bit.

> Altough I suspect it is probably a product of an undereducated person.

Or an attempt to use non-technical English. I doubt if most people know what an ASCII character is.