I also hate hints. Because it basically tells me that the person thinks that I should have offered, and they are actually having to HINT to get me to offer. As people have said, its passive aggressive, manipulative, and very annoying. People often HINT when they know they're being fucking cheeky. Asking for lifts constantly is a cheek! The more that people ask, the less likely they are to offer petrol money IMO.
It's not just lifts though.
Me and DH love our garden. We've got quite a big garden and I spend quite a lot of time in it. I love my flowers and I just love pottering around the garden, and he makes the lawns look really nice and the hedges and trees look nice.
At least three or four people every single summer between April and September say 'you can come and do my garden if you want to,' and 'you can come and paint my fence if you want to,' and 'you can come and mow my lawns and cut my hedges, if you want to.' Just joking.. But are they? I HATE these annoying silly 'jokey' hints. 
An absolute Corker for me was........ A couple in their late 20s/early 30s, moved sort of opposite us about 9 or 10 months ago. His parents live about 30 miles away and they visit maybe once a month or so. About a month ago, I was in the garden doing some weeding and trimming a couple of bushes. The young man's dad called over to me and said 'feel free to do Liz and Dan's garden if you like. You can see they're struggling with it, with the weeds growing a bit out of control and the lawn 6 inches high. Feel free to help!' with a kind of
look.
What absolute cast iron cheeky fuckery. They've been there about eight or nine months, I've only spoken to them briefly a couple of times, I hardly ever see them, and I'd never met and spoken to this man (the dad) before in my life. I don't know what made him think it was okay to TELL some random stranger to help his ADULT son and girlfriend to help them with the garden. I just looked at him and said ' ha! we struggle enough with our own garden It's big, and we're not getting any younger,' and I popped into the house and got a card for him that a local gardener had popped through the letterbox for gardening services.
He said 'ooh no, they're not paying anyone. They've got all their own tools here. Lawnmower and everything.' So the cheeky fucker is expecting people to help his son and girlfriend for FREE. Unbelievable. I said (again) 'me and my husband struggle with ours sometimes, and have had to get paid gardeners to help from time to time, so there's really no chance of us doing it. If anything, WE could do with the help!.' He said nothing and walked off. Arsehole!