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I'd be considered 'young' and would think it at least aloof so I don't think its your old-fashionedness.

• 8bitsrule 5y ago
  There used to be an old-fashioned, well-known hand-signal for this situation. You pause long enough to hold up one finger for a second or two, then return to what you were doing. The polite would then poke around or sit down or return in a half-minute or minute to see if you'd paused. The impolite would get barked at.