Husband always critical of me but cannot stand to be criticised himself. Why? ?

It's called narcissism. 

People who are feeling confident and secure and have self respect don't feel a need to call people names, criticise, bully, shout, etc. Try to help him with his self image. 

Buy him an Anthony Robbins book or audio - or he can watch the Great Man on Youtube. 

Good Luck!

Because, to him, the use of criticisms are a power play and he can't stand the thought of his own technique being used against him. 

The best defense is a good offense. Does this apply to your situation?

He's a narcissist.  Seek a divorce because he'll only get worse AND eventually he will get abusive.  Sounds like he's already there.

"Perfectionist" their greatest flaw is the inability to accept criticisms because they are already "Perfect" and it's a learned behavior...

N.Shadows

Because he thinks he's some sort of god and you are just his rather inadequate minion.  What a big head you have married.  Don't criticise him.  He's not going to change.  If you don't have any kids - dump him.  Use your feet and walk away.  That'll surprise him won't it - that his house-slave has a mind of her own and doesn't need his advice and constant criticism.