Addendum to my previous comment on account of no edit function:
The only person who truly paints the scene is the one committing the act. This means that the intentions of the accused (not the victim) are what must be considered in the actions they take. Those who genuinely do not mean to make others uncomfortable will respond appropriately to being asked to tone it down in a reasoned and polite way. They will seldom take offense unless they refuse to see what they have done wrong or believe your words are masking some other reason for the accusation (Such as prior personal disputes gone bad)
In essence, so long as the respect the person asking and do not believe they harbor ill will towards them, any decent person that is told they are making others uncomfortable will try to correct the problem instead of make it worse.