They don't force you to accept PayPal, but if you do take PayPal, you have to take all types of PayPal payments.
They do force you now if you are not a power seller. There was a hokey message along these lines:
"Since you do not have significant previous sales, accepting paypal is required to protect potential buyers." I don't remember the actual wording of course.
I added a line that I would prefer USPS money order, but if paying by paypal please do not use Credit or Debit cards. They killed my auction after I had 3 watchers and 1 bid. Of course, I also had to pay to relist again and 'might' get a relisting credit if the item sells.
My only question is does ebay have some sort of program that catches these things, or did some a-hole report my auction?