I do not have much experience of camping, but from what I read from you Tony, these matters of concern are quite normal, and probably occur at all campsites where there is a swimming pool and a bar.
French campsites have been improving for some time now, and I think that the owners are aware of possible 'sensitive' areas, such as the toilet block. I can only suggest that you wear flip-flops or similar even when visiting the loo and 'keep a stiff upper lip'! You can of course choose to visit other blocks on the site a bit further from the pool ... but to be basic, at least the toilets are being used for their intended purpose rather than certain people peeing in the pool! (Not nice, but it does happen!)
As for the bar noise, this can be a problem in any resort. However the French have a law called
tappage nocturne, which forbids noise any later than 11 pm-ish depending on the area (in my village it's 10 pm), and campsite owners do have rules for 'quiet times' on the site. If they can't/won't do anything about the bar noise after say 11.30, you could always make a complaint at the local police station or town hall.
I am sure that you will have a great time, and whilst I understand why you might have misgivings that the site will not be as good as the English ones you are used to, I am sure you will find new and good things (eg the local freshly baked bread each morning) to enjoy. Bonnes vacances!