people put the slightest emotions they get on a pedestal as a valid reason to do and justify anything.
If you approach everyone who so much as barks like they're a mad dog, you'll end up meeting a shocking number "mad dogs".
You're likely to get better service from me if you're polite. I don't feel badly about that.
I respect your position, I do, and I wish it were the standard, but realistically it puts you at a potential disadvantage.
"Fuck this product."
That appears to be before any contact with anyone at all.
That, alone, doesn't cross a line. But it is a clue that the interaction might quickly lead down a path where you choose to part ways.
I'd have been initially polite, helpful, try to fix the issue, etc. But there would be some line where I'd stop.