A baby of the age that typically suffers from colic, should not be taken anywhere by plane, and I doubt very much that the child's parents will even consider sitting for an hour or s o in an airport with a crying baby.
If they do, it will be a pleasant change for their neighbours at home.
I do not consider the grandparents' offer as inconsiderate - not well thought through, as no-one would want to travel with a baby unless forced to.
Anyone who has ever stayed in a block of flats must surely know that people come home late at night or go to work early in the morning - toilets are flushed, showers taken, loud music played, babies cry, adults make love, dogs bark and so on.
If you cannot take any of the above, then stay at home, or if you go away, stay in a luxary hotel.
Here was I thinking the snowflake generation were the young adults in their 20s and 30s, apparently our age group has snowflakes too.