I sympathise Hobnob as I have a friend who often talks as though she's superior to me, (well I thought it was just me but I've heard her do it with others too)! Here are some things she's said in day-to-day conversation:
I admit I do buy fish fingers (while I was serving them up to my own dd's!), but I only buy 100 percent cod. I replied I think they're all 100 percent cod and got no answer!
Our kids like sausages too but we don't buy the crappy ones, we get ours from local deli in town. (I'm thinking well I buy Sainsburys taste the difference, just as good surely!)
When all our kids were younger she'd always comment on how hers (apparently) reached their milestones earlier
than mine
She once recoiled in horror when I fed my one yr old dd a jar of babyfood while out! It was "I'd never dream of feeding mine babyfood in a jar, my dh wants our two only to have the best! (Fast forward a few months when I was regularly looking after her one yr old once a week and what food did she supply every time? You've guessed, babyfood in a jar!
When I mentioned we'd ordered our Xmas turkey as we're going to have a houseful Xmas day she asked where from and said "Oh it's so much cheaper if you get it from there, we always order ours from such-and-such though, X amount of £'s but such a treat! My dh saw me about to retaliate and muttered "Leave it!!" He tells me just to smile and nod with agreement at everything she says and not stoop to her level of one-upmanship but I sometimes just can't!!
What is it with some people?!