I get what you mean, but also I don't think I'm really that hesitant. It's more that I try to gauge people's interest in it and won't bother bringing it up with people who I don't think will care. I'm a teacher both by trade and in heart though, so I can't really resist the opportunity to explain systems to people lol
Generally I'll mention it offhand a couple of times over the course of a few weeks and if they seem receptive I'll steer the conversation that way whenever it seems to flow most naturally and I'll spend like an hour explaining how it works. All my friends know what their most likely type is and at least enough about the theory to follow me when I'm talking about it. My last victim was a Canadian friend I went on a roadtrip with a few weeks ago. We had about 5 hours of driving and managed to figure out he was EII. I already suspected he was, but my policy is to give people the theory and have them tell me what they resonate with most before I consider their type to be fully figured out.
My current project is figuring out how to explain it in Japanese. I've gotten better at it, but only after failing pretty miserably several times. Luckily there's a Japanese Socionics blog I can redirect people to: https://www.izayoiblog.com
Last time I went out drinking with a couple of my Japanese friends they looked through type descriptions and settled on EII and ESI respectively. Those both seemed correct to me, but I was also pretty drunk, so who knows lol