I had the same problem at the coffee shop where I used to work. I was there for 6 years and never made a good friend there. Most of them were snotty and cliquey and just, well, NT. Talking about superficial nonsense. One of them was the assistant manager's daughter who was very snotty and her circle of suck-up friends were just as bad.. One or two co-workers I got along well with when on duty but didn't make friends with them for hanging out after work or anything... the ones I got along well with were guys.. the girls were either way younger than me or the women were older than me and didn't chat with me at all...
Sometimes I'd manage to crack a good joke to make them laugh, but then they'd all go right back to ignoring me..
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Diagnosed "Asperger's to a moderate degree" April 7, 2015.
Aspie score 145 of 200
NT score 56 of 200
AQ score: 47
RAADS-R score: 196