First off, groping is very clearly not free speech. Next up, power dynamics matter. A random person hitting on you may be annoying. Your boss hitting on you and

First off, groping is very clearly not free speech. Next up, power dynamics matter. A random person hitting on you may be annoying. Your boss hitting on you and implying that you will lose your job unless you comply (or in this case, that you will lose funding) is coercion and also pretty clearly not okay.