Presumably base 32 means 26 letters + 10 digits - 4 banned letters

So adding an excluded letter is not easy.

Why not use base-31 and (optionally) more characters? (Or go upper and lower or add a symbol if you had to stay with a fixed-size and base-32 for some reason)

Because Base32 is just bit shifting and then converting the 5 bits into a char, and vice versa. Doing Base31 requires base conversion.

I don't think they took offense to the "rita" part.

analratassart would probably be just as bad

ianal

I realise you posted this as a joke, but the first time I saw this, I was so confused. I thought the comment was starting with "I anal" before I read the rest of the post only to compute it means "I Am Not A Lawyer"