I don't think you can reasonably complain about the sound of everyday living. However embarrassing you find it, plenty of flats are so badly soundproofed that you can hear everything that goes on in the bathroom and bedroom!
The only way you can tackle the problem is by asking your neighbour how much sound carries from your flat to his.
His answer may well be that he never hears you at all, as he is upstairs and sounds in flats seem to go downwards rather than upwards.
If you like, you could mention that you feel you are hearing things that don't concern you as you can hear his side of telephone conversations quite clearly.
If you feel he is shouting on the phone, he is probably hard of hearing and doesn't realise that he is talking so loudly and clomping around.
He might take the hint and talk more quietly, but human anatomy being what it is the sound of men weeing is always louder than that of women and really, apart from keeping your bathroom door shut, I don't think you can do anything about that.