AITA for refusing to give up my first-class ticket for a kid after his mom said he deserved it more than me?

Soren:

Was I wrong for keeping the first-class seat my boyfriend gifted me, even after the mom and flight attendant made me feel like I was being selfish for not giving it to her son, or was I completely justified because a booking mistake on their side should never have become my problem to fix? And honestly, if you were in my seat for your very first first-class flight, would you have given it up to avoid looking bad, or would you have stood your ground too once the request started sounding more like guilt and entitlement than a simple favor?