You have a lot to learn. No one is preventing him from commenting, critiquing, or even linking to the images he wants you to see.. but, the law does require permission before you can copy and upload or republish a photo.
All that aside, it is simply inappropriate to copy images from someone's website and post them somewhere else without permission. Had he been in the building and taken the picture himself I'd have a different opinion but, that is not the case. I expect people who view my photos to to do so from the gallery's original location where I retain the full promotional value for which it was published in the first place.
On a site where DJs constantly come seeking pictures and other content - I don't think it's too much to ask to not provide for them a ready buffet of other people's proprietary works without their consent. Try Copyscape sometime and when you come up with 23 DJs who have cut and pasted whole pages of your content into their sites, (including one who actually changed the by-line and tried to sell an article to a wedding site as his own work) you're attitude about where you want your stuff displayed will be much narrower.
My profile is empty because it works like a charm to protect my content. It's amazing how lazy people really are. Most chat room DJs believe that since my profile is empty I must be anonymous. Since I emptied all my chat profiles the instances of material stolen dropped to just 2 or 3 occasional cases. I don't and won't do gig logs, and don't want my pics posted here.