That's probably someone like me
@Aragorn
I think for me personally it's a few things. Firstly, I'm shy by nature. Once I know someone I'm an open book but I can take a bit of digging through to get there. Secondly, big career with a bit of pressure, so I purposely use the gym to zone out. Thirdly, I love my music/podcasts and I'm generally engrossed in that. Fourthly, generally between sets I'm focussed on getting my breath back. Finally, there are some epic douche sacks who like to get in others faces, it can be a bit awkward or intimidating and I don't really like that TBF.
I will say hello to a few that are ultra good people, that I feel I have a good rapport with. But mostly I'm just zoned out. It's not done to insult others, it's just my mental make up.