Well, we don't pay road tacks
Tacks evasion is illegal, on a bike or not
We should be tacksed for our infrastructure
....Alright, I think I'm done ;)
I'm often tempted to politely explain that a lower gear would make things easier for them, but really it should be easy to work that out for yourself.
I used to do rides with a friend who always had his bike in the very highest gear, it was a hybridy mtb with something like a 48-12 or thereabouts ratio, he'd stand up and mash the pedals round regardless of whether he was gently pootling or blasting it or anything in between. I'm not exaggerating when I say I only ever saw him change gears maybe once or twice in a good few hundred miles of riding together. I had brought this up on more than one occasion but it seemed he just liked to ride that way so more power to him I suppose. Although, I did help service his bike, and he had a whole host of problems developing with it due to that sustained heavy load, he even flared/rounded out a square taper crank from it.
I'm on a killer climb and have ran out of gears
There's no such thing as running out of gears, just being too unfit /grumblingroadietalk
My road bike has a 34/28 lowest gear, which as I understand is pretty low by road bike standards. I have another bike with a 22/34 lowest, that's the sort of thing where you can winch yourself up nigh on anything, into the wind with a heavy touring load. Great fun but don't plan on going anywhere fast.