I would disagree with pretty much every post above. O'Sensei was quite clear that aikido was to change yourself, and not to change others - also, he had the 'problems are opportunities to improve yourself' attitude. [maybe I should listen to that myself!]
Just because you have more experience does not mean he hasn't anything to teach you, though you would expect him to give you some respect. Maybe he's just filled with his enthusiasm for aikido and wants to spout his interesting ideas. Don't try and force locks on him, and don't leave the site (in my opinion); listen to what he has to say and give your valued opinion and ignore any rubbish or bitchiness that comes out - take what you need to improve yourself.
If nothing else you'll get better at responding to ill informed criticism!