It is a shame when sensitivity makes us too nervous to open our mouths.

That's a very good point. Generally, I put some effort into what I type and check it over before sending (though my eyesight lets me down at times when it comes to Mudcat's little typing box). Posting in a forum sits awkwardly somewhere between formal writing and informal chat. It's a conversation in which our words are cemented on to a page rather than allowed to fly off into the ether, as they would if we were all down the pub, for example. I'd only pick up on errors if the guilty party was a pompous ass who was criticising my errors (where's Sailor Jack when you need him...? :-) ), or when someone starts a thread bemoaning poor English who then (almost inevitably) exhibits examples of it himself in his own posts, though occasionally a post may look so sloppy as to be almost rude. We also need to remember that spoken language moves on a lot faster than written, so, when we're here, are we writing to each other or are we speaking to each other? :-)