As long as you wear your MBA badge front and center you will probably continue to be so.

Hot tip: Your education level is a good indicator of what you are capable of, but not the only indicator and probably not even the best indicator.

So, if instead of trying to 'leverage the title' and looking at yourself as an 'MBA', you'd change that into 'serious professional that is out to make a difference' your sensitivity will melt away and you'll realize that those that use their MBA as a means to differentiate themselves are exactly where the problem lies.

I could say the same thing about my self, "I'm sensitive to people being negative about high school dropouts", because I'm a high school drop-out. Instead, I don't care. You can judge me by who I am, what I've done and how well I've done it. Some of my buddies have PhDs, all kinds of fancy degrees, I wouldn't trade with them for any money (or title) in the world.

Be good at what you do, be excellent if you can and if you're not try harder. And don't let your MBA hold you back ;)