I am pretty certain the vast majority of adults and children labelled 'picky' by others are VERY well aware of how irritated other people are by them.
Because ya don't keep it to yourselves do you?
Oooh just try, how do you know you don't like it if you don't try it, oh go on just a little bit... ooh aren't you fussy, if you were starving you would... in my day we didn't have choice... etc etc etc, ad actual nauseum.
I would rather starve than eat something that makes me heave and gag - gagging causes me pain, it also these days causes me to choke and piss my pants. I'll take being hungry over that ta.
Eating something that disagrees with my gallstones causes me agonising, morphine requiring pain and side effects that will last for DAYS... sometimes longer. I'll give it a miss.
But you probably wouldn't know about that, because I don't tend to go into details about my many and varied health issues, it's boring, I go for the polite 'no thankyou' or 'I'd rather not thanks'.. and of course by the time you DO push and push and push and demand some explanation for the reason I won't 'ooh go on just try it', my genuine, physical, medical issues are tuned out as 'excuses'....
Ive never offered opinions on what other people eat unless its necessary, ie 'oh are you having the kippers, in that case excuse me I'll go and sit over there/pop back later'... etc.. more polite than vomiting across the table I think, but even THAT has been treated as me being rude in the past (and on that occasion when prevented from leaving because i ought to 'get over it' I did indeed vomit all over the persons table, plate, and front, violently! Something I apparently 'did on purpose'...)
Leave folk alone about what they don't eat, even little kids - I was that kid forced to eat the same meal over and over, shouted at for refusing, force fed fucking SPAM and fish - it doesn't help, at all.