I dont think its a sign of insecurity when people do point those things out, or its something they do to make themselves feel superior...myself, I try to spell things correctly, and when I dont I appreciate it when someone points it out to me...and if I make a mistake grammtically, I also appreciate it when someone points that out to me...I just take it, as being helpful...
Many people take things in various ways, tho, I guess...we are all different...
Well, if you read the above post, you will see that hispanera's motive was not pure.
One can always tell these things.