Imagine you work in a large company, and have had a great time.

After quite some time working with said large company, the manager which hired you - an inspiring, warm, and empowering person - was promoted to work in another country, and instead a new manager was hired.

This manager, now your team leader's boss, hates your guts for reason outside your control (think stuff like having kids, being "of the wrong race/nationality", etc), and to your amazement your colleagues follow suit - and your workplace is no longer engaging nd fun, but mostly a 9-5 pain.

Naturally, it's time to quit. However, as this is a large company, there'll be a leaving interview, maybe a hearing, and a reason will be asked. 

Since saying that the reason you quit is because the new manager is a jerk is not really an option, is it OK to quit without giving a direct reason? 

If not, what would you do?