Re: Being groped as a customer--I'm glad you're all right. I'm astounded that somebody would grab at your weapon like that. There are too many places to shop that welcome me to waste my time at places like that. As "that purty li'l gal", you have the disadvantage of being easily remembered. You don't blend well with the overweight, middle-aged white guy crowd. As previously stated, be sure to tell the management why you won't be back. Heck, reference this post (after you drop their name.)
Re: Teaching women to shoot. It's a shame there are neanderthals out there like this guy. An ego is that last thing you need around a gun. Everybody I've taught to shoot, I started them off with a .22 and worked up. As long as you work them up to it, I see no difference in ability between men & women.
An idea: If there is a range associated with where you work, see if you could start a Women's class. (Obviously, you would have to get certified, first.) You could do a CCW class or a beginner shooter class, or whatever. There are many aspects of CCW for women that only a woman can understand.
Mi dos centavos,