English is not my first language and so I'm not great with slang. Is it reasonable for a guy to say to a female friend let's hook up?
Background: DH has a female friend. They've known each other for over 25 years, she has grown up children, has a new husband who is lovely and most importantly she is a very principled lady, she'll tell you if you cross the line. I met her only a few years ago but I really like her. But my DH likes a banter and occasionally crosses the line and she kind of accepts that i.e. calling her old girl, even though he's older than her.
She's got a little parcel for us and lives quite far. It's hard for them to meet since Covid but if they happen to be near each other whilst at work, then they meet outdoors and have a chat. Last week they were arranging over the phone to meet up and had a long chat about everything, family, work etc, and at one point DH say ok, let's hook up at this time blah blah...then a laugh. I thought that was odd, but it was supposed to be banther I guess, however she cancelled the meet up straight away and now sort of avoids him. Is this supposed to be offensive?