Yeah it pisses me off when I've been squeezed for every drop for the whole project by some bozo manager, and then I'm also now forced to be forget and forgive all of that, and pretend to be happy, because of some awkward celebration, just becomes another ass kissing for the manager and salt in the wounds for me.
Corporate "celebrations" are anything but. They are just posturing and virtue signalling. Only on groups of teams in high-trust situations (e.g., a small military unit winning a tough battle) will you experience real celebrations. They won't even have to be planned; they'll just happen!