After divorce do some parents become reluctant to give their time to their children?

No gender stereotypes, just a general question? My child was raised with his mum and dad, one parent would always be present during activities and the other would be present on occasion. One parent would predominantly be social, while the other would rarely be seen and even rarer without their partner. Things went tits up and it broke down, ones been on several European trips, of which the majority were spoke about as destinations for family holidays and yet the child has not been on one, social media although not a barometer of decency, is filled with memories, but slim pickings of any with the child? Yet the other parent who protects, prioritises and is present, is sold as the one who ruined the family. Sometimes I don’t think people realise how difficult it is to bite your tongue when your child tells of acts of selfishness that you were once treated with, because you’re protecting an image of someone who didn’t exist. Courts might not help, but children realise soon enough, but it will still be somebody else’s fault they turn to the parent who was present!