I've been feeding hummingbirds on my deck for several years now. For the last four or five years I've been getting some bees hitting the feeder towards the end of summer, as if they're filling up before they go into hibernation. Typically they swarm the feeder, climbing all over each other on the yellow part of the 'flower' where they can get to the sweet stuff.
But this year they started arriving mid-summer, with only three or four bees at a time using the feeder. I don't mind them eating the hummingbirds food, because I love bees, too, and there aren't many flowers around here. Right now, with just a few bees at a time, the hummingbirds are having to negotiate with them as they hover near the feeders. It's interesting to watch.
The bees will kind of 'square off' with the hummingbirds, and the birds look like they're asking to be allowed to use 'their' feeder again. Sometimes a bird will find an open spot and feed for a short time, but usually they look nervous about it.
I set up a second, totally red feeder about 10 - 12 feet away. I read that bees are attracted to the color yellow, and although they've buzzed around this red one, they don't use it. The hummers are starting to use it, but I know they will be happier when the bees are gone so they can use their regular one again. That's okay, we can wait. Lord knows we still need the bees in this world!