Having a DM "help" is like having a food-taster show up at dinner to make sure I'm cooking properly.
If I ask for help, that's fine. Otherwise, stay the hell away and don't get butt-hurt when your intrusion isn't welcome.
1 - Neither your putative food taster nor DM really knows if you're a good cook or careful diver (and if you are a good cook, maybe he just wants a little extra...).
2 - If that food taster, like the DM, has been hired by the owner of the kitchen and told specifically to check on you and all the other cooks (of widely varying skill levels) using said kitchen, then he's just doing his job.
If a DM chooses to setup my gear, fine. I'm still going to say thanks, and check it to make sure it was done right. If he grabs the valve right before I jump in, it's no big deal, since reaching back for a final check of my valve is just about the last thing I do before I splash.
At no time in all this does anyone get "butt hurt". Unless the rocking boat causes them to inadvertently sit down on a tank valve, of course.