I am hearing this more and more. Whether it is for future "immunity passports" or just to get past all the fear, many young people see COVID-19 as inevitable. Better to get it now during lockdown than after everyone heads back to work/school.
One thing that is cropping up is the fact that young people really do not appreciate old people telling them what to do with their bodies. Grandma telling you to disinfect your hands is one thing. Grandma telling you that you aren't allowed in the same room as your boy/girlfriend for the next year is another. Listening to the police talk about the parties they break up, they sound like chaperones at a school dance trying to enforce a no-touching rule.
Furthermore, there's still a great deal of uncertainty as to what chronic or long-term effects infection can visit even upon those who recover. While most accounts of that concern those who suffered serious complications, it's far from clear that those with mild symptoms can't be affected similarly.
Realistically, going out of one's way to get infected is dangerously irrational with as little as we still know.