In a live recording the guitar bleed can be neat. but if it is an overdubbed production, it is a nightmare.
The only time bleed is a problem when recording drums is when the drummer does not play with the appropriate dynamics. If he beats the cap out of the snare, but gently taps on the toms, that will force you to crank the tom mics, which will bring up the snare in those mics. since those mics are processed to make the toms sound good, it can make the snare bleeding through sound bad.
There are three fixes for that:
1. Sample replacement for the toms.
2. gates/editing
3. new drummer
the easiest being #3. I know that not everyone has the luxury of just replacing a drummer, but you at least have to let the drummer know that a professional will have a handle on things like that. If he is interested in being a professional, he needs to step up.