Let me know which bars you're going to so that I can make sure to stay away.
Filthy faucets make beer taste terrible, and the disgusting flavor is that of bacterial growth.
There is a good reason why some things taste bad to us- it's an evolutionary adaptation to tell us that it's dangerous. Just because you don't need to be hospitalized immediately afterwards doesn't mean that ingesting large amounts of bacteria is doing your system any favors.
I have a habit of closing out many of the bars I've frequented, both as a customer, and as a performer. Some craft, some not, but I've seen most of them go through the cleaning process as they start closing taps down for the evening- this includes several restaurant chains where they had nothing more interesting than Bud Light on draft.
Sometimes they disassemble the tap, sometimes they just flush it out with a cleanser, but a bar that cares about cleanliness in the slightest WILL clean their faucets and lines.
If you leave faucets operational for months at a time without basic sanitation, it's akin to having a hobo come in and lick the glasses clean instead of washing them.
Next time you're in a bar, ask them how often they clean their lines and faucets. If they give you a dumbfounded expression, you should leave.
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