@ziggy7570 It is, considering the original argument.
If it was "he's a minor, it's illegal" there would be a different counterargument.
But the "argument" (I have trouble calling it that) was "he's a kid".
First, he's 14-15, hardly a "kid".
Second, BECAUSE he's 14-15, he's sexually mature, interested in girls, in sex, and old enough to date. Just not old enough to date someone older than 18 (legally).
Third, he likes her (and he's old enough to understand those feelings, generally).