Do you think it's right to request that drive thru customers waiting for food should be asked to park in you reserved handicap parking spots? When I asked manager on duty today her response was to hang up me?!?!?

No, it is not right. Those spots are reserved, however if they're is no place else for you to pull forward and wait at all it may be the lesser of 2 evils. As far as the manager, she should be FIRED! She obviously has no business in customer service if she's hanging up on her guests , this is unexcusable behavior for restaurant management. If it been a regular hourly employee they probably could have gotten some type of written or oral reprimand...

I agree they should have spots for people waiting for their food

No