

I agree with the anime trope part, but that only complicates your position.
Is it strange because the anime girl is physically young? Then there’s no issue with Kes.
Is it strange that she’s psychologically immature? Then there’s an issue with dating ANYBODY that is immature or sheltered, which is a much more difficult metric to gauge and standard to set.
Or is it an issue with her chronological age? Then nobody is ever allowed to have interspecies relationships, unless their aging speed matches.
Neelix had met Kes just a single time a month prior to them being introduced in the show. If that’s grooming, then every vacation fling is also grooming