I’m not sure the term is that problematic really. The qualifier ‘young’ makes a huge difference - it radically shifts the ways in which rights, responsibilities and expectations are framed.
People should be able to make decisions about things that affect them. Young people should be able to too but with the understanding that they are young - they are inexperienced, their brains and bodies are immature, and so on. So the fact they are young people means the are necessarily treated differently from the larger category of ‘people’. We make special provision for them and, sometimes, adults make decisions on their behalf because the best interests of the young person (child) is the guiding principle.
The children/young person distinction is a way of making this more palatable for the young people while retaining the idea that (while they may be considered more capable than younger children/people) older children still don’t necessarily have the capacity to know what’s best (or good) in a holistic and long term way. They simply have not developed sufficiently.
The fact that mermaids use the term is only a reflection of how widespread it is. It’s not indicative of anything more sinister. There’s lots of other pretty ordinary language that mermaids use too.
The issue is where people seem to disregard the effect of young in the phrase. Because they don’t want recognition that young people need protection from gender ideology (and from themselves in this regard). Mermaids and their counterparts want us to treat them as ‘people’ without considering the effect of them being young. While still mobilising the moralising effect of ‘young’ to prevent people looking more
deeply into the hyperbole around these young people suffering without (hugely medicalised) intervention.
TL;DR - the problem is mermaids and the whole ideological project, not the term young people itself.
It’s just a bit twee and nauseating when HT’s go on about ‘our young people’ etc.