This is fine provided you extend the 'don't moan' principle to both the government and to people who are against raising the thresholds, when they experience the consequences of disincentivising people to earn more.
For ordinary people, that might look like less access to particular skills. Maybe your GP can't get a locum because of people feeling it's not worth their while doing the extra shift once you factor in the extra tax. Maybe you can't get a skilled tradesman, maybe it's a pain in the arse at work because you've recruited for ages and nobody wants the internal promotion... all kinds of permutations. And for the government, that means not bleating about low British productivity.
Although in general I think it's better to consider this topic dispassionately rather than framing it in terms of moaning and entitlements. People have a range of responses to economic incentives and most of us have a point at which we don't think it's worth working harder or more, sometimes at which we can't afford to if we have costs like childcare. This is a fact and an inevitability, and the sensible thing would be to think about how we can most beneficially respond to it.