Why are single women a threat?

When my neighbour moved in I made a card and posted it through her letter box she didn't say thank you or anything and for months after she kept playing loud chanting music to the early hours.
Over time she has locked herself out her home and nearly burned the place down.
I've helped her on both occasions.
I was more concerned because she has a young son.
She has thanked me but been very distant. Which is OK.
Anyways it seems she has a partner.
Since I got my puppy he's been friendly and spoken to me.
So much so that when my dog sees him he wants to greet him. So instead I lift him and wave his paw, he asks me how we are getting on and that's it really.
The other day I bumped into them when I was on my way out, I said hi to him first then I said hello to her.
I saw a look of contempt come over her face.
The same happened again the other day I was coming in the same time as the partner we both said hello...
I let him into the building and he followed behind.
She came out and started at him in their language.
I am a single woman and I guess yes I have had different sexual partners, maybe more than I'd like to say in the last year. As I'm basically looking for someone. Anyways that doesn't change me from being a decent human, I keep to myself generally and don't really bother anyone.
I'm not after her partner but I can't help but be friendlier to him especially when he's not been so unkind.
Why are single women a threat?
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