This may sound quite trivial and maybe a bit snobbish (I'm not) but there are a couple of things about DP that are really starting to grate.
He works in an industry where saying things like C U Next Tuesday wouldn't raise any eyebrows outside of office setting. He's mid management, people of similar level are the same. He speaks quite well most of the time, but when describing negative things or recalling events from work, his language is foul - not just the words he uses, but the tone of voice too, it can sound nasty.
I will say DP doesn't have a nasty bone in his body, he's kind, helpful - the type to help a stranger with luggage or reaching items on high shelves in supermarket etc. There is zero malice from him in any area of his life - but I worry how people perceive him if they heard him speak so awfully at times.
The other issue is he's hugely self-deprecating! I think we all can be at times, but he just seems more so than most. His childhood and past relationship will have played a large part here, but this isn't something he wants to explore with counselling etc.
I've gently raised both these points, but his ex wife was horribly controlling and used to 'warn' him before going to places about his conduct - like you would a small child. I don't want to come across like that as imagine it could be triggering for him.
Not sure what I'm after from this post - any advice on gently (nit my strong point) tackling these issues welcome.