I mean, I don't think we need to tiptoe around voicing opinions about things, especially in context (in a coffee shop that sells the thing) as casual conversation. Things like "I've never understood the appeal of pumpkin spice, and how is went from a corporate marketing flavor to an inescapable and pervasive social phenomenon that assaults my senses everywhere I go in public starting in September and persisting through to Christmas." Put that in your comic speech bubble.
But, yeah, mocking people who are buying sugary caffeinated drinks is as silly as mocking people for drinking hot cocoa. My objection to pumpkin spice is that people drinking them are may as well be walking around with thuribles; it's as stinky as second-hand smoke.
Who looks more ridiculous? The monkey that paid a stupid amount of money for a delicious treat they couldn't have gotten at home, or the monkey that paid a stupid amount of money for someone else to peel a regular ass banana for them? It's a pretty basic "don't throw stones in glass houses" analogy.
Pumpkin spice syrup is cheap, a milk frother is cheap.
Better yet, you can get a cheap, low-end espresso maker/milk frother and it’ll pay for itself (vs Starbucks prices) in like, 10-20 drinks (depending on the drinks and the espresso maker).
This is how I enjoy iced oatmilk shaken espressos of whatever flavor I want (currently almond chai) every morning without leaving the comfort of my kitchen. 😁
Edit: that said, sometimes I do want a fancy drink I do not have the equipment, flavoring, or patience to make myself and then a coffee shop is wonderful.
Monkeys could probably made to drink coffee. It'd be easier to have them drink iced coffee, since hot drinks are further from their habits, but hot coffee might not be out of the question either with enough patience and the right conditioning.
Monkeys could probably be made addict to caffeine.
They probably shouldn't tho.