It turns out that some colleagues thought I was intimidating/scary. I mentioned this to dh and he said some of his friends had asked him if he was scared of me too!
This is such strange news to me. I always thought of myself as quite nice and chatty/friendly.
DH thinks it’s because I’m a well educated woman and some men find that intimidating. I’m well spoken, dress fairly traditionally, and I suppose not awfully unattractive.