I hate it when I spend ages preparing a meal and someone puts S and P on it before checking whether it's actually required. Totally fine if they taste it first and want some - it's always on the table - but the assumption that they are going to need more salt without tasting is irritating..
I know that MN is strongly divided on this, but I'll never understand why some people take it so personally as an unequivocal insult.
If you know that you like food significantly saltier and/or peppery than average, why wouldn't you be conscious of this and thus prepare automatically to season your own food in accordance? I like absolutely shed-loads of pepper - even on things like baked beans or mashed potatoes, which many people (as is their absolute prerogative for their own food) look horrified at. It could not possibly be too peppery for me. To the extent that they will often make the 'hilarious' quip of "Are you sure you've got enough [name of main food/dish] with your pepper, there, ho, ho ho?!!"
I wouldn't dream of assuming that my outlying preferences are normal - and thus I would never consider serving up food to others seasoned as I would choose to season it for myself; but equally, I reserve the right to have my own food seasoned as I wish and would view it dimly as controlling for somebody else - even the chef - to try to tell me exactly how I should enjoy my own food.
Similarly, I know people (one very close friend in particular) who find the idea of any amount of medium-strong condiments appalling, and cannot understand why I would enjoy ketchup, mustard or horseradish at all. We both know and completely respect each other's choices for our own food, but I'm not going to bother tasting various foods that lack these (imho delicious condiments) first, as some kind of bizarre social custom, before deciding to get/order some of the abovementioned (to me, essential) accoutrements.
Do you similarly take offence when people know that they want to add these sauces straightaway and, if so, what's the difference?
To be honest, I don't really see it as any different from a vegan moaning at an omnivore's desire to eat meat or an omnivore's jibes to a vegan that "that's rabbit food, didn't you want a proper meal".
You could also take it ad absurdum by getting offended at anybody ordering something 'standard' rather than something à la carte or on the 'chef's specials of the day' board - or a fellow diner ordering a dish but asking for it without one particular stated ingredient that they are not allergic to or ethically have any objection to, but simply know that they don't like the taste of.
Even if the chef is left feeling grossly insulted and wanting to scream "Well, you say instantly that you don't like mushrooms; and yet you've never yet even tried my mushrooms, or seen/tasted the way that I prepare them!"