You need to get over it or at least get a grip on reality. No manager in his right mind is going to charge you a restocking fee for something they just rang up, 15 seconds ago... especially after you tell him you were not informed about the restocking fee. And even if he still tried to charge you, all it would take is a call to corporate to clear it up. Speaking of calls.....
I called my local store and customer service. Apparently, HF has started charging restocking fees on *SOME* items, starting this month. They are not charging on *ALL* items and in fact, there are about 140 items that will have restocking fees. This seems quite reasonable to me, given how many people treat them as a free rental service on the expensive things like generators and welders. I'm sure they have other reason, as well.