I went to Sportsmans Warehouse to buy 100 rounds of .22lr and 100 rounds of .22 magnum.

The lady at the checkout wouldn't let me purchase them because I am not 21.  I explained that they are rimfire and I can buy them and she said no you can't.

I was so freaking angry.  

I am not going to shop there again.  I will bring my business else ware.  

Quoted: Ask to speak to a manager.

That's the way Grownups handle these kind of things.

next time ask for a manager, and have him educate the retard employee.
i hated dealing with this shit when i was underage as well. if you dress nice, talk smooth, you can get them to understand that the ammo is for legal use and they best sell it to you or you will be writing a letter to their corporate office addressing this issue and why you and your family will never shop there again.