you know what, some of you should be ashamed of yourselves.
There has been confirmation from the Towers that this isn't fake.
Yes it's been 18 years - would we diss and mock a woman who had only decided to question DV after 18 years? No we'd support her and advise where possible. Not castigate and blame her.
This person has an issue with her relationship, however unpalatable.
OP, yes in answer to your question, it's completely disgusting and certainly not just one of those 'does it happen to everyone but no one mentions it?' kind of things.
A very close friend of mine suffered similar with a new partner when they first got together, he was more angry than mortified and saw her disgust as an overreaction.
It was only once she let him know that the thought of it meant she would struggle to be intimate in any way with him, or indeed continue the relationship that he made any kind of 'effort'
to improve his habits.
He still has the odd incident. In his case, his parents were pretty lax re personal hygiene too so it was learnt behaviour. He'd literally never come across anyone who told him to stop!
I'd ask DP if you think you should ask around and see if his friends think it's ok to leave shit on the wall of their homes and gauge their reaction.