My boyfriend [26 M] thinks that it's unethical, that my friends and I [24 F] use "family plans" to save money on a lot of stuff

My 4 closest friends and I are all really reliable with money, I trust all of them to pay me back for anything that we split the cost of. We all started taking advantage of "family plans" for various services despite being unrelated. For example, we share one Amazon account. We have family plans on Netflix and Spotify. We all share one "fuel discount" account, and alternate who gets the discount each month. The fuel rewards level up a lot, the more you spend at the grocery chain, so 5 people on an account gets us better discounts than each of us having our own. We got ourselves a "family plan" to our local gym, and during the summer, go as a "family" to the local pool. My friends who game share their Steam libraries. One of my friends and I have a family plan for our cell phones.
We joke about being sisters / stepsisters / adopted sisters, or something. It's funny because I'm an irish redhead, one of my friends is asian, and another is half asian and dyes her hair pastel pink, one's black, and one's white but super tan. We couldn't look any more different.
It never felt too unethical, we were all tight on money to various degrees during college and while starting out with our professional lives. And so many things are set up for couples, or families, to get the best deal, rather than single people. So what was the harm in becoming a family? We've been doing this for years, starting in college and there haven't been any issues with someone not paying their fair share. Venmo makes it really easy to handle shared bills, whenever one of us gets a bill, we just request everyone's share of the cost. Every time, I've been paid back within the day.

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I mentioned some of this stuff casually to my boyfriend of 5 months, James. First, I think I mentioned something about being happy it was my turn to use the fuel discount, because my friends and I had spent enough on groceries this month to fill my tank of gas for free. He asked how we'd managed that, and I said that the five of us had a family plan for fuel discounts through a chain of grocery stores and gas stations. And that the rewards compound the more you spend, so it was a better deal to all go in as a "family"
Another time, I was figuring out with my friends whether we should extend the swimming pool membership for one more month, and I mentioned that it would probably be worth it, because it would be just over 10 dollars each, and we'd probably go a few times. My boyfriend asked how we'd got the membership so cheap, he had bought membership in the past and it was 60 dollars a month. I said that we all got a family membership, and split it five ways.
He asked me adter that how much stuff we signed up for as a "family" and I gave him the whole list. I told him that I was saving at least 1500 dollars a year, doing this.
He was shocked to hear that, I think. That I was saving that much.
Last weekend, he started telling me how unethical it all was, that we were using stuff meant for families. That those kinds of deals exist so people can get their kids on their phone plans, or to the pool, or something, without spending exorbitantly. And that people like me, with only myself to support, rather than kids or a stay at home spouse, are not the people those things are meant for.
I was kinda surprised he said that, it's not like I'm loaded with cash, or any of my friends are. And it didn't seem like we were doing anything too wrong. A lot of people I know do that on a smaller scale, like sharing Netflix passwords in college.
But he was super against me and my friends taking advantage of family plan discounts. And I admit he's right, it's misleading to call my unrelated friends my family, but it seems generally harmless overall. He really disagrees, and it just seems a little crazy that this has become such a big disagreement between us. He literally keeps bringing it up, when I use my gym membership or swimming pool membership, or Amazon, or anything.
Is he right that I'm doing something unethical? Or is it no big deal? If it's really not a big deal, how do I convince him to lay off?
TLDR - I get family plans with my friends who I am not related to, to save money. My boyfriend thinks we're doing something unethical.


Source.