Good grief you have a lot of pent up animosity here.
I don’t know how old the kid is. If he’s 14, should he be as informed about these matters as you and I?
People can be very wrong, but not be a morally miniscule individual. They are just not informed as to what the rules of this type of situation are.
Do you know this is the only boy who was with this girl? Do you know his economic status? Do you know if the other boy(s) may have come from poorer families, and she might be motivated to accuse the boy with the most wealthy home?
There are a number of unknowns here. There’s no need to be angry. This will resolve over time.
At the minimum, the boy’s lawyer should demand the mother prove he is the father before any discussion of child support occurs.