I sent him $50 - please pay by the AM or get a bad rep & hopefully my paypal money back - I'm on a low income
Don't worry about it, even if he doesn't give you the coins, you can chargeback, even as a gift. Thats why doing Paypal to BTC trades are stupid.
I've bought Bitcoins from people before for Paypal, and whenever I do, I mark it as payment for website design, or coding work, and I leave in the comments that I was completely satisfied with their work, or something like that. What people don't realize is that all paypal payments are reversable, gift or not, and if Paypal finds out you were doing a crypto trade, they get mad.
All that said, if he does give you the coins, be a good guy and don't chargeback