Jermain's 'one chance-one goal' display at his old club silenced a chorus of ferocious booing, but Glenn says: "The fans having a go at him was not a problem for Jermain. I know him well now as a person and going on to pitch and hearing the boos would only make him even more fired up.
"They have got to remember that booing him would only motivate him and if I was a Charlton supporter I wouldn't boo him too much next time.
"He has a really assured character, has great confidence in his own ability and it only served to give him a lift to inspire him to do even better.
"It was terrific for him to go back to The Valley and score in the manner he did, he made it look easy but in reality it was a difficult chance to tuck away.
"The eyeball contact and concentration he needed while the ball was dropping out of the air showed excellent skill and ability.
"Really and truly, had we held out, it should have been a fairytale winner for him, but it wasn't to be."
Turning his attention to the next London derby, against Tottenham on Saturday, he says: "Having watched Tottenham against Arsenal last week I saw them put in an excellent performance.
"They were terrific and really pinned Arsenal in; it was all Tottenham in the first 45 minutes and the passing through the team was good - as you would expect from a Glenn Hoddle side.
"They were a real threat in the air on Saturday with Ferdinand, Sheringham and Poyet on set plays and Dean Richards and Ledley King attacking the box.
"You can see they are a major threat on crosses and set plays, and to be quite truthful that is where we found things difficult against Charlton; it is where we must learn quickly and make sure we are up to that job on Saturday."
5/4 on a Hammers win and 13/8 on Defoe scoring on Saturday - click here for details.