What a ridiculous thing for them to complain about.My current place isn't too bad either but there is still a slightly subtle undertone of favouritism towards parents.
Ive mentioned it before I think on here, but I take my leave at times of year when it's often cheaper to travel, like many childfree folk. Our company workload naturally slows for certain periods due to lots of parents time off ie Easter, mid July. My boss went off on one once about how I wasn't taking my leave at 'normal' times of year like 'everyone else' . Thankfully nothing else ever came of it but it made me self conscious for a bit about booking for example, 2 weeks off in September or January.
I always take holidays September, October & occasionally May or early June and it’s always outside of school holidays!
Why would I go away in school holidays when I don’t have a reason to? It would cost me more money, the place I’m going to would be rammed with kids and the uk roads & airports would be mental.