No, I don’t think you are being unkind, but first off, I’m not blond and not a female. So not even close to your ditzy neighbor. And yes, my time really is worthless because I have a lucrative retirement income, I busted my butt to earn. So enjoying the fruits of my labor. Something many won’t have, I realize.
I am helping the cashier, and the brain-dead wandering around trying to appear busy, to keep their jobs. So maybe you could consider that. I think I’m helping the college kids working at the stores I trade with. I’ve been working since I was 15 in one way or another. If UPS, FedEx, or USPS is the best you can do I applaud you. At least you’re working. If Walmart is your career, the same, at least you are trying to achieve independence. I worked for Walmart after I retired. I called it “my fishin money”. They offered me a Greeter position when I told them I wanted to quit after 4 nights of pushing a dust mop at $9.■■ an hour. (Just under minimum wage at the time.) So yeah, I’ve actually been in those shoes. Have you? 
Serious thought? Yep, sure have, even done it. But I’m also not the Welfare office either. (although the way I spend money, people might think I am.) FYI, I’ve paid the $6.99 several times. I just needed something and didn’t want to do a Costco run. (The hundred dollar store) I’ve also added more spools to get to the free shipping requirement. (Oh Gosh. You don’t suppose the guys in shipping had to work for free because I did that, do you?) It doesn’t matter if it’s an item that actually costs less than the shipping charge, or a pile that falls short of the $85.00 minimum to qualify for free shipping. $6.99 S&H is baloney.
Incidentally, I do shop on eBay as well. Often. Folks there often offer free shipping. The ones that don’t? They don’t get my business. I’ve even bought filament on eBay.
Paying for shipping is definitely an option for me, one I rarely pay. I’m a consumer, I am the customer. And I will ply my options when I want to. I can buy Genuine Bambu Labs filament at my local Best Buy for the same prices as online, and not pay extra for shipping and handling. So I do.
Sorry if I choose to play my cards differently. You might want to consider being more of a counsellor, and not a con-seller.
Final word: Insignia™ TPU 1.75mm Filament Black NS-3FTPU2BK - Best Buy
Note, $19.99 plus whatever taxes in your area. Yes, you actually have to get off your butt and go get it. In my case there is a Jack In The Box right across the parking lot, and a Trader Joes right next door. I could kill two or three birds with one stone if I wanted a burger or something from Trader Joes.
Shipping and Handling charges tacked on is false advertising. Bottom Line. If you just lay there and take it at least ask for a kiss.