Public transit should be free (Or very inexpensive) to anyone who wants to use it. It's better for the environment, people's wallets, and the transit system itself if it was disconnected from ticket revenue. BART can certainly do more to enforce cleanliness and making sure no one is doing drugs on the trains, but that also requires more funding.
>I also have no interest in subsidizing the people I know can afford to pay.
Cars are subsidized endlessly via roads, associated maintenance, and parking on public property that could otherwise be used for something more productive. Many people with decent paying jobs own multiple cars banking on the fact that they can use public property to store their personal car, so they're also casually freeloading.
Living in a car-dependent world significantly drives up housing costs for everyone in the region. Many of BART's stations are surrounded by and zoned exclusively for single family homes with a lawn and a garage, which is ridiculous.