Want To Slap Him Right In His Stubborn Mug

My coworker likes to have his opinion heard, which is fine. I will often nod along even if I don’t agree or have no idea what he is on about. Sometimes his opinion is so based on ignorance or stupidity or just fundamentally flawed that I don’t bite my tongue and instead try to show him reason.

A new branch of a global warehouse membership company has opened near our work. [Coworker], of course, has his opinion on it and why the membership is a scam and how it should all be free. After several minutes of the one-sided conversation, he changes tack.

Coworker: “Anyone who pays for membership is a mug.”

Me: “You think so?”

Coworker: “Paying to save money? Mugs, all of them.”

Me: “I paid and have saved more than the membership fee. And that’s on filling up my car alone.”

Coworker: “Well, you don’t save it, really, do you?! It’s just a ploy. A mug’s game.”

Me: “A full tank is around £4 cheaper and I fill up once per week. I have had my membership since it opened, which is about ten weeks. That is more than I spent on the membership fee.”

Coworker: “Yeah, but—”

Me: *Interrupting* “I acknowledge that saving on food isn’t that much, but I probably save another £5 a month on cleaning supplies which would pay for the annual membership in seven months.”

Coworker: “You’ve just been taken in by their advertising.”

Me: *Sighing* “Whatever you say, [Coworker].”

There really is no point in trying to make him see reason; he is just so much smarter than everyone and has to be right. I renewed my membership last month and continue to use the store regularly. [Coworker] never even went inside to check.