Ok I actually kind of have mixed feelings about this. "You're wanted, not needed" is a really abrasive way to say it but that is actually a good attitude to have towards dating. Them needing you means a messy breakup if things don't work out.
And the joke is obnoxious but also kind of funny tbh bc 3/4 ton is absolutely insane amount for someone to weigh 😂 so maybe he is actually a subtle shitposter