Using 'dorky' can imply a lack of social skills or popularity. He had a dorky way of laughing that others found endearing but a bit odd.
Pro Tip 2/3
Negative Connotation
'Dorky' often carries a gentle negative meaning, but it's not deeply insulting. Don't take it personally; we all have dorky moments sometimes.
Pro Tip 3/3
Informal Use
The word 'dorky' is informal, suitable for conversation but not formal writing. My brother's dorky humor is not always appropriate in our formal family gatherings.