Actually I'm in agreement with you, Betty! I like to criticize spelling/grammatical errors on a message board only under the following conditions: 
The maker of the errors (TMOTE) is a known idiot who has posted something obnoxious
TMOTE is consistently and obnoxiously pedantic about spelling/grammatical errors 
TMOTE has inadvertently written something they might want corrected 
TMOTE can be quoted for teh funny (misspelled intentionally)
I can spell, and write well when needed, but I don't always bother on message boards. Because I'm lazy. 
