That's a 2.24x price increase. That's even beyond Argentina-hyperinflation levels of increase. Are we sure this is an apples-to-apples comparison? Like, was there a sale or bulk discount that made the shorter can relatively cheaper? I'm struggling to believe a retailer would engage in such a brazen markup in a single week. (Not to say it's not possible, but it's extreme enough that I'm not taking the word of some random hand-written graphic on the Internet.)
I mean... I'll regularly go to the grocery store and see soda prices vary by 200-300% week-to-week. Sure, it's all based around "sale" value, but it amounts to the same thing. If it's $9 for 2 12-packs one week and then $11 for a 12-pack the next week, it isn't an invalid markup because you had to buy 2 to get the first price.
I'm more inclined to blame the manufacturer for the price increase (in this case Coke) as opposed to the retailer. Especially in this case, I kinda doubt a company as large as Coke would allow retailers to stray from the price they want by more that a few cents.
It's not an apples to apples comparison. This was a reddit post made by someone who went out of their way to buy things for different amounts to make ragebait.
It's a dumb post and it is safe to ignore it. Sadly someone reposted it here.