I'm no expert, but that doesn't sound like SPD. I think if someone with SPD were uncomfortable in a social situation, they would either a) leave or b) not have socialized in the first place. There are people with schizoid symptoms (such as myself) who can socialize normally if required, but it's not a "twitch" or something I can't help. I can blend in just fine if I want to, but I am controlling it, not an unwanted twitch.

If this bothers you, perhaps you could talk to your therapist about it like you mentioned? (That brings me to another point - someone with SPD, I think, would very rarely talk to their therapist about a concern revolving around socializing - most people with SPD are fine with not socializing and don't seek help for it).

Like FooZe mentioned though, your problem could occur in someone with or without SPD, everyone is unique!