As I develop bare spots in my lawn any more, I replace it with clover. It stays green and the bees and deer both love the flowers. Not exactly what the neighbors want to see in a bermuda lawn, but we're W-A-Y out of the neighbors sight, so for us it works.
What's best for the bees is weeds and no mowing or chemicals at all, but going that extreme is typically not an option. On the other end is spraying your yard for everything at every opportunity, having no flowering weeds anywhere, and keepin it trimmed to the 1-1/4 inches to 1-7/8 inches that the homeowners association allows . . . well, you get the idea . . . .
The final answer is going to be, what are you comfortable with. Your bees will not die out because you sprayed your dandelions. Woud it be better for them if you didn't? Of course. But what amount of sacrifice to your lawn's aesthetic are you willing to sacrifice for the sake of the bees? In the end it's a personal choice, and odds are, your bees won't know the difference as long as there's that good farmland within a mile (unless he sprays, too!!!).
On the practical application of lawn care though- If you can, use SPOT treatments only, and try to use them at times that the bees are not flying (dusk is best, though for some weed killers that will not work).