I don't know. I don't really think about my friends' single status or not. I mean, I might take it into account if thinking of booking a restaurant table, but that's all.
The reason I don't tend to think about it is because I'm usually the single one, and it has always been so. Never had boyfriend at school or uni. Other relationships have lasted a brief time or a few years, but have mostly been distance relationships, so have still functionally been single when it comes to nights out with friends.
I have spent time over the years wondering why men don't seem to find me attractive. Some of it is because I'm overweight, some because I don't wear make-up. Obviously there will always be some where we're incompatible personality-wise. I work in a male-dominated industry and in at least two workplaces, I have challenged male colleagues on sexist comments, and had the response, "you don't count, you're one if us!" (Yes, that's not actually the point. It's not okay to say that whether or not I'm here or seen as one of you or not.) So some men don't really see me as a woman.
I am very self-reliant (because I've been single for so long, and had to be,) and I fill my time with swimming, yoga, evening classes. At the weekend, I mentioned to a friend that my self-confidence is pretty low currently, and she said she never sees me as someone lacking confidence, so maybe I come over as not needing anyone else to others, to. And that's true in that I don't need anyone, but sometimes I'd like someone, at least for sex.
I tried OLD, but over a year, I had very few responses at all, and no actual dates. I know I'm far from perfect, but I also don't think I am as hideous as all that. I clearly don't know how to "sell" myself, though.
I don't have a complete ticklist for men. I want someone who can make me laugh and think, and isn't a complete sexist arsehole, but I'm now approaching 50, so I'm not expecting a Greek god, either. But equally, I am usually happy doing my own thing, so I am not going to settle for just anyone, but someone who is going to be worth giving some of that up for.
I don't know what my friends think about me being single. They probably don't think about it at all these days, because I usually have been for all the years they've known me.